Add Lights AIDL HAL support to LightsService

Add conditional code to LightsService to call the new Lights AIDL HAL
where available and fall back to the 2.0 HIDL HAL if not.

Bug: 142230898
Test: manual; send a notification with lights; display backlight set ok
Test: see followup commit for atest instructions.
Change-Id: I6ca278bf789ae1e7473ce132a895099ad236b26a
Merged-In: Ic9b4fbc5570ea49cff903df27c9714bed23bf98c