Move SOFT_SERIAL_PIN to data driven (#19863)

keyboards/lets_split/sockets/config.h

@@ -25,9 +25,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define DIODE_DIRECTION COL2ROW
 
-/* serial.c configuration for split keyboard */
-#define SOFT_SERIAL_PIN D0
-
 /* ws2812 RGB LED */
 #define RGB_DI_PIN D4
 

keyboards/lets_split/sockets/info.json

@@ -5,5 +5,8 @@
         "vid": "0xFEED",
         "pid": "0x0BEE",
         "device_version": "0.0.1"
+    },
+    "split": {
+        "soft_serial_pin": "D0"
     }
 }