Fix to resolve collision between RNG in settings.h and the STM32 Cube…

… HAL (ex: stm32h7xx.h). In STM32 platforms we use NO_OLD_RNGNAME (see https://github.com/wolfSSL/wolfssl/blob/master/examples/configs/user_settings_stm32.h#L616)

wolfssl/wolfcrypt/settings.h

@@ -297,7 +297,7 @@
     #if FIPS_VERSION_LT(2,0)
         #define WC_RNG RNG
     #else
-        #ifndef WOLFSSL_STM32L4
+        #ifndef NO_OLD_RNGNAME
             #define RNG WC_RNG
         #endif
     #endif