CHROMIUM: rtc: s5m-rtc: Real-time clock driver for s5m8767.

CHROMIUM: rtc: s5m-rtc: Real-time clock driver for s5m8767.

Driver largely based off implementation in
  git://git.insignal.co.kr/samsung/exynos/android/kernel/samsung/exynos3.0

Although it would not backport cleanly.  Commits were:

  a781deb rtc: s5m: Modify read function for s5m8763
  e03092e rtc: Fix the minor bug for s5m8767a
  6f82705 rtc: Set initial time in s5m8767a rtc
  9e47078 mfd: Add wtsr and smpl function for s5m8767a
  49f0e86 rtc: Modify rtc_set_time for s5m rtc driver
  537c944 rtc: Modify s5m8767a EVT3 rtc driver
  4c0332b rtc: Add s5m rtc driver

Signed-off-by: Todd Broch <tbroch@chromium.org>
BUG=chrome-os-partner:19036
TEST=manual, compiles & kernel boots.

Change-Id: I06e01e0171bd2f044977c0f4dfe34cea7641a35f
Reviewed-on: https://gerrit.chromium.org/gerrit/50530
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>