Do not warn about CONFIGURATION_EMBEDDING if it wasn't enabled (#23408)

Warnings.cpp was warning about `CONFIGURATION_EMBEDDING` on AVR boards even if it wasn't enabled. Check the status of the feature before auto-disabling and warning about it.

Marlin/src/inc/Conditionals_adv.h

@@ -1006,7 +1006,7 @@
 #endif
 
 // AVR are (usually) too limited in resources to store the configuration into the binary
-#if !defined(FORCE_CONFIG_EMBED) && (defined(__AVR__) || DISABLED(SDSUPPORT) || EITHER(SDCARD_READONLY, DISABLE_M503))
+#if ENABLED(CONFIGURATION_EMBEDDING) && !defined(FORCE_CONFIG_EMBED) && (defined(__AVR__) || DISABLED(SDSUPPORT) || EITHER(SDCARD_READONLY, DISABLE_M503))
   #undef CONFIGURATION_EMBEDDING
   #define CANNOT_EMBED_CONFIGURATION defined(__AVR__)
 #endif