octopus: correct GPIO - KB_BL_PWR_EN to UNIMPLEMENTED

First wave projects don't have any board with keyboard backlight so the
GPIO - KB_BL_PWR_EN should be configured by macro of UNIMPLEMENTED
instead of output direction.

BRANCH=octopus
BUG=b:130329644
TEST=buildall

Change-Id: I5c37b4b5ec3eb3f629c6d494064a6a27a3a1417c
Signed-off-by: Marco Chen <marcochen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1564493
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Diana Z <dzigterman@chromium.org>
4 files changed