power: go to hibernate mode immediately if woken up by rtc overflow.
power: go to hibernate mode immediately if woken up by rtc overflow.

If platform uses PSL (Power Switch Logic) for hibernating and RTC is
also supported, this CL determines whether ec is woken up by RTC with
overflow event (16 weeks). If so, let it go to hibernate mode
immediately for better power consumption.

BRANCH=none
BUG=b:171919875
TEST= test console command "hibernate" with NPCX_LCT_MAX = 1000 and
enable chipset_task on npcx9 EVB.

Signed-off-by: Mulin Chao <6bbc5af053a1dfdc363be6857f30de4ac3bcbd16@nuvoton.com>
Change-Id: I52543ee3cd980d444758c6a0cab32c34bd690b9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2835259
Reviewed-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec