keyboard_scan: Add option to support keyboards with language ID

ID pins are considered additional KSOs while keycode scanning works
for the existing KSI0 ~ KSI7. While diriving ID pins, the state of
interconnection between ID pins and KSI pins could be used for
identifiers to tell keyboard itself. (e.g. US, Japan,and UK keyboard)

BRANCH=master
BUG=b:80168723
TEST="make -j buildall"
TEST=Verified 5 distinct keyboard samples w/ different Language ID values
     on the same reworked Coral, which VOL_UP and VOL_DOWN were reworked
     for ID pins. crrev.com/c/1053617 is my experimental patch on top of
     this for further verification

Change-Id: I1d6e647df74c50d60bc1264c045b2587d0bf23d8
Signed-off-by: paris_yeh <pyeh@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1068951
Commit-Ready: Paris Yeh <pyeh@chromium.org>
Tested-by: Paris Yeh <pyeh@chromium.org>
Reviewed-by: Paris Yeh <pyeh@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

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