Add support for Keychron Q4 (#19048)

keyboards/keychron/q4/ansi_v1/rules.mk

@@ -0,0 +1,28 @@
+# MCU name
+MCU = STM32L432
+
+# 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 USB N-key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+DIP_SWITCH_ENABLE = yes
+RGB_MATRIX_ENABLE = yes
+RGB_MATRIX_DRIVER = CKLED2001
+LTO_ENABLE = no
+EEPROM_DRIVER = wear_leveling
+WEAR_LEVELING_DRIVER = embedded_flash
+
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE
+