[Userspace] Add Nasu to userspace code (#17524)

* Define Nasu indicator pins in userspace

* Add userspace indicator code to Nasu

users/stanrc85/config.h

@@ -30,3 +30,9 @@
   #define ENABLE_RGB_MATRIX_MULTISPLASH
   #define ENABLE_RGB_MATRIX_TYPING_HEATMAP
 #endif
+
+#ifdef KEYBOARD_nasu
+  #define INDICATOR_PIN_0 B1
+  #define INDICATOR_PIN_1 B0
+  #define INDICATOR_PIN_2 A7
+#endif

users/stanrc85/rules.mk

@@ -43,3 +43,8 @@ ifeq ($(strip $(KEYBOARD)), mechlovin/adelais/standard_led/arm/rev4/stm32f303)
   SRC += rgb_timeout.c
   SRC += indicator_layers_sneakbox.c
 endif
+ifeq ($(strip $(KEYBOARD)), nasu)
+  SRC += indicator_layers_sneakbox.c
+  SRC += startup_fanfare.c
+  OPT_DEFS += -DHAS_INDICATORS
+endif