[BUG] Massdrop develop rgb fix (#12022)

* Allow for disabling RGB_MATRIX on Massdrop boards.

* Fixup init sequence.

* Make some functions static as they've got very generic names.

keyboards/massdrop/ctrl/config_led.c

@@ -79,4 +79,4 @@ void rgb_matrix_indicators_kb(void)
 }
 #endif // USB_LED_INDICATOR_ENABLE
 
-#endif
+#endif // RGB_MATRIX_ENABLE