Move backlight config to data driven (#19910)

keyboards/spiderisland/split78/config.h

@@ -22,7 +22,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROWS 8
 #define MATRIX_COLS 14
 
-#define BACKLIGHT_PIN D4
-#define BACKLIGHT_BREATHING
-
 #define I2C_START_RETRY_COUNT 1

keyboards/spiderisland/split78/info.json

@@ -8,6 +8,10 @@
         "pid": "0xF4E4",
         "device_version": "0.0.1"
     },
+    "backlight": {
+        "pin": "D4",
+        "breathing": true
+    },
     "processor": "atmega32a",
     "bootloader": "bootloadhid",
     "debounce": 50,