AES-ECB: add CIPHER_ENCRYPT_ONLY dependency for DECRYPT test cases

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/tests/suites/test_suite_aes.function b/tests/suites/test_suite_aes.function
index d495b49..2aa27d3 100644
--- a/tests/suites/test_suite_aes.function
+++ b/tests/suites/test_suite_aes.function
@@ -6,6 +6,7 @@
  * master, enc and dec must be AES context objects. They don't need to
  * be initialized, and are left freed.
  */
+#if !defined(MBEDTLS_CIPHER_ENCRYPT_ONLY)
 static int test_copy(const data_t *key,
                      mbedtls_aes_context *master,
                      mbedtls_aes_context *enc,
@@ -55,6 +56,7 @@
      * with alternative implementations. */
     return 0;
 }
+#endif
 
 /* END_HEADER */
 
@@ -86,7 +88,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:!MBEDTLS_CIPHER_ENCRYPT_ONLY */
 void aes_decrypt_ecb(data_t *key_str, data_t *src_str,
                      data_t *dst, int setkey_result)
 {
@@ -523,7 +525,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:!MBEDTLS_CIPHER_ENCRYPT_ONLY */
 void aes_ecb_copy_context(data_t *key)
 {
     /* We test context copying multiple times, with different alignments