Remove split.transport.protocol=serial (#24191)

keyboards/controllerworks/mini36/keyboard.json

@@ -44,7 +44,6 @@
             "pin": "GP1"
         },
         "transport": {
-            "protocol": "serial",
             "sync": {
                 "indicators": true,
                 "layer_state": true,

keyboards/controllerworks/mini42/keyboard.json

@@ -44,7 +44,6 @@
             "pin": "GP1"
         },
         "transport": {
-            "protocol": "serial",
             "sync": {
                 "indicators": true,
                 "layer_state": true,

keyboards/cradio/keyboard.json

@@ -45,9 +45,6 @@
         },
         "serial": {
             "pin": "D2"
-        },
-        "transport": {
-            "protocol": "serial"
         }
     },
     "community_layouts": ["split_3x5_2"],

keyboards/keebio/sinc/rev1/keyboard.json

@@ -26,7 +26,6 @@
     "split": {
         "enabled": true,
         "transport": {
-            "protocol": "serial",
             "sync" :{
                 "indicators": true
             }

keyboards/keebio/sinc/rev2/keyboard.json

@@ -26,7 +26,6 @@
     "split": {
         "enabled": true,
         "transport": {
-            "protocol": "serial",
             "sync" :{
                 "indicators": true
             }

keyboards/salicylic_acid3/guide68/keyboard.json

@@ -51,9 +51,6 @@
         "handedness": {
             "pin": "B6"
         },
-        "transport": {
-            "protocol": "serial"
-        },
         "serial": {
             "pin": "D0"
         }