Add support for using HAL forecast for thermal headroom

Remove the instance lock on thermal HAL binder call, each system server
binder thread doesn't need to wait for each other after getting the HAL
instance, and they should only reconnect if the instance wasn't updated.

Bug: 383211885
Flag: android.os.allow_thermal_hal_skin_forecast
Test: atest ThermalManagerServiceMockingTest ThermalManagerServiceTest
Change-Id: I56c8fd4e9c8776460299c0bd284136e2929220c1