servo_micro: Add keyboard controls to servo micro and CCD

Add keyboard controls, like kb_press, to the overlays of
servo micro and CCD. Helpful for debugging.

BUG=b:66211919
TEST=Run "dut-control kb_press:enter_key" on servo micro.

Change-Id: I320db73584f19de791491050b0e8070c9a541d56
Reviewed-on: https://chromium-review.googlesource.com/724167
Commit-Ready: Wai-Hong Tam <waihong@google.com>
Tested-by: Wai-Hong Tam <waihong@google.com>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
2 files changed