[init] sync hw clock at device shutdown
[init] sync hw clock at device shutdown

BUG=680

TEST=in BIOS, set hw clock back some amount.  Boot, wait for ntp to sync (or force it, or reset the system clock manually).  After rebooting, the new clock time should have stuck.

Review URL: http://codereview.chromium.org/600023

joshfire/chromiumos-platform-init