In order to prepare for checking RTC failure in the early boot paths move the rtc failure calculation to pmutil.c and add a helper function to determine if failure occurred. BUG=b:63054105 Change-Id: I88bf9bdba8c1f3a11bc8301869e3da9f033ec381 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/21554 Reviewed-by: Subrata Banik <subrata.banik@intel.com> Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>