Fix some preprocessor guards

Fix the build in some configurations.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/suites/test_suite_pkparse.function b/tests/suites/test_suite_pkparse.function
index 6c904a3..3227ce9 100644
--- a/tests/suites/test_suite_pkparse.function
+++ b/tests/suites/test_suite_pkparse.function
@@ -14,7 +14,7 @@
 #define HAVE_mbedtls_pk_parse_key_pkcs8_encrypted_der
 #endif
 
-#if defined(MBEDTLS_PSA_CRYPTO_C)
+#if defined(MBEDTLS_PSA_CRYPTO_C) && defined(MBEDTLS_FS_IO)
 static int test_psa_bridge(const mbedtls_pk_context *ctx,
                            psa_key_usage_t usage_flag)
 {
@@ -62,6 +62,7 @@
     return ok;
 }
 
+#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
 /* Whether a pk key can do ECDSA. Opaque keys are not supported since this
  * test suite does not create opaque keys. */
 static int pk_can_ecdsa(const mbedtls_pk_context *ctx)
@@ -80,7 +81,8 @@
     return 0;
 #endif
 }
-#endif /* MBEDTLS_PSA_CRYPTO_C */
+#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
+#endif /* MBEDTLS_PSA_CRYPTO_C &&  && MBEDTLS_FS_IO */
 
 /* END_HEADER */