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: manual; basic device sanity check
Change-Id: Id5f7bfc74cef6d584c42712fcbea816e456b8b2d
Exempt-From-Owner-Approval: Reviewed in OOO OWNERS's stead.