[Keyboard] M60 split 5x12 lego pcb (#14383)

* add m60 lego case in split, with stm32f401 and 411

* Update keyboards/mlego/m60_split/m60_split.h

* Update keyboards/mlego/m60_split/rev1/config.h

* Update keyboards/mlego/m60_split/rev2/config.h

* address the moving of enum in keymaps

keyboards/mlego/m60_split/rev1/rules.mk

@@ -0,0 +1,24 @@
+# MCU name
+MCU = STM32F401
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# 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 = yes           # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+SPLIT_KEYBOARD = yes
+SERIAL_DRIVER = usart
+ENCODER_ENABLE = yes        # Enable encoder
+
+LAYOUTS = ortho_5x12
+