[Feature Request] Enable layer lock

[gingershaped]

Feature Request Type

• Core functionality
• Add-on hardware support (eg. audio, RGB, OLED screen, etc.)
• Alteration (enhancement/optimization) of existing feature(s)
• New behavior

Description

I'd appreciate it if the LAYER_LOCK_ENABLE field was set in keychron_common.mk to allow for the use of layer lock without needing to compile the firmware myself.