Migrate features and LTO from rules.mk to data driven (#23302)

keyboards/mechanickeys/undead60m/keyboard.json

@@ -27,6 +27,19 @@
     "ws2812": {
         "pin": "F7"
     },
+    "build": {
+        "lto": true
+    },
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "encoder": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": false,
+        "rgblight": true
+    },
     "matrix_pins": {
         "cols": ["F0", "F1", "E6", "C7", "C6", "B6", "D4", "B1", "B0", "B7", "B5", "B4", "D7", "D6", "B3", "B2"],
         "rows": ["D0", "D1", "D2", "D3", "D5"]

keyboards/mechanickeys/undead60m/rules.mk

@@ -1,14 +0,0 @@
-# Build Options
-#   change yes to no to disable
-#
-BOOTMAGIC_ENABLE = yes      # 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 = no            # Enable N-Key Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
-RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
-AUDIO_ENABLE = no           # Audio output
-ENCODER_ENABLE = yes
-LTO_ENABLE = yes