* [Core] Rework PS/2 driver selection
Enabling and selecting PS/2 driver was using old approach,
so it was reworked to current approach, inspired by Serial
and WS2812 driver selections.
* [Keyboard] Update keyboards using PS/2 to use new PS/2 driver selection
* [Docs] Update PS/2 documentation to use new PS/2 driver selection
* Fix indentation
* [Core] Add PS2 to data driver
* Fix oversight in property name
Co-authored-by: Drashna Jaelre <drashna@live.com>
* Add PS/2 pins to data driven mappings
Co-authored-by: Drashna Jaelre <drashna@live.com>
* Remove unnecessary IS_COMMAND definition in clueboard/66/rev4
* Replace keyboard_report->mods with get_mods() in IS_COMMAND definitions
* Update docs to use get_mods() instead of keyboard_report->mods
* Replace keyboard_report->mods with get_mods() in tmk_core/protocol/usb_hid/test
For some reason, this occurrence used KB_LSHIFT and KB_RSHIFT, which don't exist
* Replace keyboard_report->mods with get_mods() in Massdrop keyboards (as per @patrickmt)
