Tegra: kbc: Allow keypresses during startup

Add support to detect keys pressed before keyboard driver is loaded.

BUG=chromium-os:17229
TEST=Built and tested on Seaboard. Reset seaboard keeping any key pressed and
verify system enters u-boot console.

Change-Id: I7508c901b79bf92be755a6e81a9556ccba4c78b1
Signed-off-by: Rakesh Iyer <riyer@nvidia.com>
Reviewed-on: http://gerrit.chromium.org/gerrit/4964
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed