detachables: Allow 'Tab' to display debug info on all screens

Since we're continuing to support the boot shortcuts Ctrl+D, Ctrl+U and
Ctrl+L, it makes sense to also continue to support the debug info
shortcut Tab, just in case somebody may want to use it from an external
keyboard. This does not affect the existing method to display debug info
through the appropriate menu option in any way.

BRANCH=None
BUG=b:73080278
TEST=make runtests, booted Scarlet and pressed Tab on UART.

Change-Id: Ia08404e0ffd1f8cac3d85f3b2fc4ce17a21d743d
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/907759
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
2 files changed