Add RGB Matrix support for Preonic rev3 (#12008)

* Add g_led_config for RGB Matrix support

* Corrected indentation

* Undo indentation on existing rev3.c code

Co-authored-by: filterpaper <filterpaper@localhost>

keyboards/preonic/rev3/config.h

@@ -124,6 +124,7 @@
 #define RGB_DI_PIN A1
 #define RGBLED_NUM 9
 #define RGBLIGHT_ANIMATIONS
-
+// RGB Matrix support
+#define DRIVER_LED_TOTAL RGBLED_NUM
 
 #endif