Pixel Thermal HAL: change to use hysteresis to rate limit notification

Add optional config for hysteresis, default to 0.0
Add optional config for monitoring sensors, default to false
Make cold throttling an optional config, default to NAN

Test: boot test and lshal debug
Bug: 117334272
Change-Id: I11a451f189ad31ab802a1697444822f50110831e
7 files changed