Migrate features from rules.mk to data driven - EFGH (#23248)

keyboards/handwired/k8split/keyboard.json

@@ -8,6 +8,14 @@
         "pid": "0xC868",
         "device_version": "0.0.1"
     },
+    "features": {
+        "bootmagic": false,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
     "matrix_pins": {
         "cols": ["C7", "C6", "B6", "B5", "B4", "D7", "D6", "D4"],
         "rows": ["D5", "D3", "D2", "D1", "D0", "B7"]

keyboards/handwired/k8split/rules.mk

@@ -1,12 +0,0 @@
-# Build Options
-#   change yes to no to disable
-#
-BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
-MOUSEKEY_ENABLE = yes       # Mouse keys
-EXTRAKEY_ENABLE = yes       # Audio control and System control
-CONSOLE_ENABLE = no         # Console for debug
-COMMAND_ENABLE = no         # Commands for debug and configuration
-NKRO_ENABLE = yes           # Enable N-Key Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
-RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
-AUDIO_ENABLE = no           # Audio output