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
Change-Id: Ic9b4fbc5570ea49cff903df27c9714bed23bf98c
Exempt-From-Owner-Approval: Reviewed in OOO OWNERS's stead.