thermal: update powerhints for thermal trips

- Add 5C for LITTLE core trips
- Set Big early throttling at 5C above control temp after
  trip change to avoid irq storm. This would act as alert for
  PI loop

Bug: 241784772
Test: Device can boot to home and Tj thresholds changes properly by
powerhint.

Change-Id: Id9ddb9aad98a7a6d192f97001317e1eff72c6246