Move SOFT_SERIAL_PIN to data driven (#19863)

keyboards/qwertyydox/config.h

@@ -35,11 +35,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* COL2ROW or ROW2COL */
 #define DIODE_DIRECTION COL2ROW
 
-/*
- * Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN.
- */
-#define SOFT_SERIAL_PIN D0
-
 #define RGB_DI_PIN D6
 #ifdef RGB_DI_PIN
     #define RGBLED_NUM 12

keyboards/qwertyydox/info.json

@@ -9,6 +9,9 @@
     "pid": "0x1256",
     "device_version": "1.0.0"
   },
+  "split": {
+    "soft_serial_pin": "D0"
+  },
   "bootloader": "caterina",
   "processor": "atmega32u4",
   "layouts": {