* [Keyboard] Support MJ64 which is a 60% Hotswap RGB keyboard with arrows
and the size of left shift is 2.25U
* Update keyboards/melgeek/mj64/mj64.h
* Update keyboards/melgeek/mj64/keymaps/default/keymap.c
* Update keyboards/melgeek/mj64/keymaps/via/keymap.c
* Update keyboards/melgeek/mj64/keymaps/via/keymap.c
* Update keyboards/melgeek/mj64/keymaps/default/keymap.c
* Update keyboards/melgeek/mj64/keymaps/via/keymap.c
* Update keyboards/melgeek/mj64/rev2/rules.mk
* Update keyboards/melgeek/mj64/rev1/rules.mk
* Update keyboards/melgeek/mj64/keymaps/via/keymap.c
* Update keyboards/melgeek/mj64/info.json
* Update keyboards/melgeek/mj64/info.json
* Update keyboards/melgeek/mj64/rev1/config.h
* Update keyboards/melgeek/mj64/rev2/config.h
* Update the VID and PID in mj64/config.h
add the rev1/rev1.c
add the rev2/rev2.c
