Fix build error in CI about test_fail_if_psa_leaking

During test of component build_arm_linux_gnueabi_gcc_arm5vte and
build_arm_none_eabi_gcc_m0plus. It fails with
 - error: implicit declaration of function
   ‘test_fail_if_psa_leaking’

It happens because test_fail_if_psa_leaking is defined in
helpers.function. This block of code is not converted into C code
while compiling ssl_helpers.c. The function has been moved to
psa_crypto_helpers.c in order to fix this build error.

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index 08179e2..f8b98c0 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -104,11 +104,11 @@
  * `TEST_ASSERT( ! mbedtls_test_helper_is_psa_leaking( ) )`
  * but with a more informative message.
  */
-#define ASSERT_PSA_PRISTINE()                                          \
+#define ASSERT_PSA_PRISTINE()                                           \
     do                                                                  \
     {                                                                   \
-        if (test_fail_if_psa_leaking(__LINE__, __FILE__))            \
-        goto exit;                                                  \
+        if (mbedtls_test_fail_if_psa_leaking(__LINE__, __FILE__))       \
+        goto exit;                                                      \
     }                                                                   \
     while (0)
 
@@ -122,12 +122,12 @@
  * \note Persistent keys must be recorded with #TEST_USES_KEY_ID before
  *       creating them.
  */
-#define PSA_DONE()                                                     \
+#define PSA_DONE()                                                      \
     do                                                                  \
     {                                                                   \
-        test_fail_if_psa_leaking(__LINE__, __FILE__);                 \
-        mbedtls_test_psa_purge_key_storage();                          \
-        mbedtls_psa_crypto_free();                                     \
+        mbedtls_test_fail_if_psa_leaking(__LINE__, __FILE__);           \
+        mbedtls_test_psa_purge_key_storage();                           \
+        mbedtls_psa_crypto_free();                                      \
     }                                                                   \
     while (0)
 
@@ -193,6 +193,14 @@
  */
 psa_key_usage_t mbedtls_test_update_key_usage_flags(psa_key_usage_t usage_flags);
 
+/** Check that no PSA Crypto key slots are in use.
+ *
+ * If any slots are in use, mark the current test as failed.
+ *
+ * \return 0 if the key store is empty, 1 otherwise.
+ */
+int mbedtls_test_fail_if_psa_leaking(int line_no, const char *filename);
+
 /** Skip a test case if the given key is a 192 bits AES key and the AES
  *  implementation is at least partially provided by an accelerator or
  *  alternative implementation.
diff --git a/tests/src/psa_crypto_helpers.c b/tests/src/psa_crypto_helpers.c
index 06274d3..77c2f89 100644
--- a/tests/src/psa_crypto_helpers.c
+++ b/tests/src/psa_crypto_helpers.c
@@ -138,4 +138,15 @@
     return updated_usage;
 }
 
+int mbedtls_test_fail_if_psa_leaking(int line_no, const char *filename)
+{
+    const char *msg = mbedtls_test_helper_is_psa_leaking();
+    if (msg == NULL) {
+        return 0;
+    } else {
+        mbedtls_test_fail(msg, line_no, filename);
+        return 1;
+    }
+}
+
 #endif /* MBEDTLS_PSA_CRYPTO_C */
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index eb0dc03..efe8408 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -80,25 +80,6 @@
 /*----------------------------------------------------------------------------*/
 /* Helper Functions */
 
-#if defined(MBEDTLS_PSA_CRYPTO_C)
-/** Check that no PSA Crypto key slots are in use.
- *
- * If any slots are in use, mark the current test as failed.
- *
- * \return 0 if the key store is empty, 1 otherwise.
- */
-int test_fail_if_psa_leaking(int line_no, const char *filename)
-{
-    const char *msg = mbedtls_test_helper_is_psa_leaking();
-    if (msg == NULL) {
-        return 0;
-    } else {
-        mbedtls_test_fail(msg, line_no, filename);
-        return 1;
-    }
-}
-#endif /* defined(MBEDTLS_PSA_CRYPTO_C) */
-
 #if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
 static int redirect_output(FILE *out_stream, const char *path)
 {