[Keyboard] Fix up and clean Corne Keyboard code (#6284)

* Fix corne  communication issues with LTO

* Fix up other issues with corne code

* Fix indentation

* Clang Format rev1 file for Corne

keyboards/crkbd/rules.mk

@@ -1,5 +1,5 @@
-SRC += i2c.c
-SRC += serial.c
+QUANTUM_LIB_SRC += 	i2c.c \
+					serial.c
 SRC += ssd1306.c
 
 # if firmware size over limit, try this option
@@ -64,7 +64,8 @@ MIDI_ENABLE = no            # MIDI controls
 AUDIO_ENABLE = no           # Audio output on port C6
 UNICODE_ENABLE = no         # Unicode
 BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
-RGBLIGHT_ENABLE = yes       # Enable WS2812 RGB underlight.
+RGBLIGHT_ENABLE = no       # Enable WS2812 RGB underlight.
+
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend