Use last (not first) RTC in the system by default

Most of our systems only have one RTC, but Exynos5 based Chromebooks
usually have two: an external rtc0 on the PMIC and an internal one on
the SoC. While only the first one keeps an accurate time across S0, the
only thing our tests really use them for is wake alarms, which work on
both. The external RTC has a problem delivering interrupts in very late
stages of suspend, however, so let's just default to the internal one.

CQ-DEPEND=CL:56666
BUG=chromium:221857
TEST=power_Resume

Change-Id: Ic3ce108969a04f87b7bee179757483274f98b56c
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/56667
Reviewed-by: Daniel Erat <derat@chromium.org>
1 file changed