Migrate SPLIT_HAND_PIN to json (#23924)

keyboards/keebio/iris/rev4/config.h

@@ -1,20 +0,0 @@
-/*
-Copyright 2019 Danny Nguyen <danny@keeb.io>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#pragma once
-
-#define SPLIT_HAND_PIN D5

keyboards/keebio/iris/rev4/keyboard.json

@@ -53,6 +53,9 @@
                 ]
             }
         },
+        "handedness": {
+            "pin": "D5"
+        },
         "matrix_pins": {
             "right": {
                 "cols": ["D4", "D7", "D3", "B7", "F0", "B3"],