Migrate build target markers to keyboard.json - P (#23565)

keyboards/preonic/rev3_drop/keyboard.json

@@ -6,6 +6,18 @@
         "pid": "0xA649",
         "device_version": "0.0.3"
     },
+    "features": {
+        "audio": true,
+        "bootmagic": true,
+        "command": true,
+        "console": true,
+        "dip_switch": true,
+        "encoder": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true,
+        "rgblight": true
+    },
     "rgblight": {
         "led_count": 9,
         "animations": {

keyboards/preonic/rev3_drop/rules.mk

@@ -1,20 +1,2 @@
-# 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 = yes        # Console for debug
-COMMAND_ENABLE = yes        # Commands for debug and configuration
-NKRO_ENABLE = yes           # Enable N-Key Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
-RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
-AUDIO_ENABLE = yes          # Audio output
 CUSTOM_MATRIX = yes
-ENCODER_ENABLE = yes
-DIP_SWITCH_ENABLE = yes
-
-# Do not enable RGB_MATRIX_ENABLE together with RGBLIGHT_ENABLE
-RGB_MATRIX_ENABLE = no
-
 SRC += matrix.c