Kernel/HID: Introduce initial USB keyboard support

[Olekoop]

It was tested with qemu's usb-kbd. The code is based on USB Mouse driver

[supercomputer7]

This looks mostly OK now, although I didn't test this. I'd suggest merging this and extensively testing this before making this device a default of some sort.

[BuggieBot]

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[stale[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions!

[stale[bot]]

This pull request has been closed because it has not had recent activity. Feel free to re-open if you wish to still contribute these changes. Thank you for your contributions!