[Keymap] Add pico 70 keys keymap (#7654)
* Move pico/rev1 to pico/65keys. * Add pico/70keys. * Remove unneeded codes. * Modified valid 70 keys keymap for jis.
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* Move pico/rev1 to pico/65keys. * Add pico/70keys. * Remove unneeded codes. * Modified valid 70 keys keymap for jis.