Remove the library provided function of MBEDTLS_PARAM_FAILED

The function called through the macro MBEDTLS_PARAM_FAILED() must be supplied by
users and makes no sense as a library function, apart from debug and test.
diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index 4a2efde..d099571 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -41,8 +41,7 @@
 extern "C" {
 #endif
 
-#if defined( MBEDTLS_CHECK_PARAMS ) && defined(MBEDTLS_PLATFORM_C) && \
-    !defined(MBEDTLS_PARAM_FAILED)
+#if defined( MBEDTLS_CHECK_PARAMS ) && !defined(MBEDTLS_PARAM_FAILED)
 #define MBEDTLS_PARAM_FAILED( cond, file, line )                               \
                                         mbedtls_param_failed( cond, file, line )
 
@@ -67,7 +66,7 @@
  */
 void mbedtls_param_failed( char* failure_condition, char* file, int line );
 
-#endif /* MBEDTLS_CHECK_PARAMS && MBEDTLS_PLATFORM_C && !MBEDTLS_PARAM_FAILED */
+#endif /* MBEDTLS_CHECK_PARAMS && !MBEDTLS_PARAM_FAILED */
 
 /**
  * \brief       Securely zeroize a buffer