This adds a very simple RTC device and implements reading the time of
day based on the host's time of day. It currently doesn't support
setting the time or wake up alarms but could do so in the future.
Also instantiate it and add the appropriate nodes to the device-tree
for ARM guests.
BUG=chromium:833825
TEST=manual test on kevin, date is properly set when VM is started
Change-Id: I032ec7df2cba9e9016966eb4160b413fec9a40ba
Reviewed-on: https://chromium-review.googlesource.com/1038801
Commit-Ready: Sonny Rao <sonnyrao@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
