Move backlight config to data driven (#19910)

keyboards/8pack/config.h

@@ -6,8 +6,6 @@
 /* Locking resynchronize hack */
 #define LOCKING_RESYNC_ENABLE
 
-#define BACKLIGHT_LEVELS 8
-
 // ws2812 options
 #define RGB_DI_PIN D2 // pin the DI on the ws2812 is hooked-up to
 #define RGBLED_NUM 8 // number of LEDs

keyboards/8pack/info.json

@@ -8,7 +8,8 @@
     "pid": "0x2171"
   },
   "backlight": {
-    "pins": ["D1", "D0", "D4", "C6", "D7", "E6", "B4", "B5"]
+    "pins": ["D1", "D0", "D4", "C6", "D7", "E6", "B4", "B5"],
+    "levels": 8
   },
   "processor": "atmega32u4",
   "bootloader": "caterina",