common: Add timezone library

Timezone is ported from Chromium.
Tracking /etc/localtime to know region and timezone.

BUG=b:63280507
TEST=emerge-${BOARD} arc-camera3-libcamera_timezone
CQ-DEPEND=CL:664500

Change-Id: I6aca1ee477c5d232145e3d78907d38a438f2b9cf
Reviewed-on: https://chromium-review.googlesource.com/650072
Commit-Ready: Heng-ruey Hsu <henryhsu@chromium.org>
Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
4 files changed