Add hook into thermalservice

1) restart thermalservice if servicemanager dies
2) restart zygote if thermalservice dies as we don't have death notifier
registered for this native service
3) set to foreground task for thermalservice to speed the callback

Fixes: 118495176
Bug: 113037689
Bug: 118509057
Test: kill and see service restarts
Change-Id: I50785592a19b7a667a4f1ff42bc9ea218e81f758