Rename Light to LogicalLight to avoid namespace conflicts when adding

AIDL HAL lights support.

LogicalLight is the internal implementation of Light that used to be
exposed directly from LightsService and consumed by
NotificationManagerService and a few more other places. The new
canonical API is going to be android.hardware.lights.Light, hence
renaming this one.

Bug: 142230898
Test: make checkbuild # (actual tests in followup patch)
Change-Id: I3d31eeee675278cd472a197d3a975add26264bb1
Merged-In: Id5f7bfc74cef6d584c42712fcbea816e456b8b2d