This commit adds a new event type, `ELOG_TYPE_LOW_BATTERY_INDICATOR`,
to the event log. This event is logged when the system boots due to
a low battery condition. It includes the reason for the shutdown,
currently only supporting "Power Off".
BUG=b:339673254
TEST=Able to capture the eventlog for low battery boot event.
```
> elogtool list
9 | 2025-02-03 09:44:19+0530 | Low Battery Boot | Power Off
```
Change-Id: I5cc5e5f540657c7dfd174a4928e697a272da813a
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86223
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Dinesh Gehlot <digehlot@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
d25a73d9a7