[Keyboard] add 60% pcb for the smk 2nd switch(with mx mount) (#5928)
* add smk60 pcb
* remove useless keymap
* Update keyboards/smk60/rules.mk
add 60_iso layout
Co-Authored-By: fauxpark <fauxpark@gmail.com>
* fixed 60_iso layout
* update header file macro
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yulei