Move SOFT_SERIAL_PIN to data driven (#19863)

keyboards/keebio/bfo9000/config.h

@@ -30,9 +30,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* Locking resynchronize hack */
 #define LOCKING_RESYNC_ENABLE
 
-/* serial.c configuration for split keyboard */
-#define SOFT_SERIAL_PIN D0
-
 /* ws2812 RGB LED */
 #define RGB_DI_PIN B4
 #define RGBLED_NUM 20    // Number of LEDs

keyboards/keebio/bfo9000/info.json

@@ -8,6 +8,9 @@
       "pid": "0x1169",
       "device_version": "1.0.0"
     },
+    "split": {
+        "soft_serial_pin": "D0"
+    },
     "processor": "atmega32u4",
     "bootloader": "caterina",
     "layouts": {