Move backlight config to data driven (#19910)

keyboards/25keys/aleth42/rev1/config.h

@@ -28,10 +28,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define ENCODERS_PAD_A { B5, F5 }
 #define ENCODERS_PAD_B { B6, F6 }
 
-#define BACKLIGHT_PIN C6
-#define BACKLIGHT_BREATHING
-#define BACKLIGHT_LEVELS 8
-
 #define RGB_DI_PIN B3
 #ifdef RGB_DI_PIN
    #define RGBLED_NUM 8

keyboards/25keys/aleth42/rev1/info.json

@@ -2,6 +2,11 @@
     "usb": {
         "device_version": "0.0.1"
     },
+    "backlight": {
+        "pin": "C6",
+        "levels": 8,
+        "breathing": true
+    },
     "processor": "atmega32u4",
     "bootloader": "atmel-dfu"
 }