Move encoder config to data driven (#19923)

Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/hillside/48/0_1/info.json

@@ -13,6 +13,11 @@
       "pid": "0x67C0",
       "device_version": "0.0.1"
     },
+    "encoder": {
+        "rotary": [
+            {"pin_a": "F5", "pin_b": "F4"}
+        ]
+    },
 
     "features": {
         "encoder": true,
@@ -21,7 +26,14 @@
     },
     "split": {
         "soft_serial_pin": "D2",
-        "main": "left"
+        "main": "left",
+        "encoder": {
+            "right": {
+                "rotary": [
+                    {"pin_a": "F4", "pin_b": "F5"}
+                ]
+            }
+        }
     },
 
     "rgblight": {