display: Allow temperature sensor to be specified per display.

Add a temp sensor field in display device configuration.
The sensor will be used to monitor the thermal status of display
hotspot instead of always relying on SKIN(overall device) temp.
If config not given we will fall back to SKIN temp.

Add feature flag sensor_based_brightness_throttling to track tempSensor.

Bug: 279114539
Test: atest DisplayDeviceConfigTest
Change-Id: I5179b15671a20c5d12e690b51509f298ba515b3b