Return a copy of InputDeviceLightInfo instead of pointer

Refactor InputReaderInterface to return a copy instead of pointer. This
will ensure that we don't read from memory that's been freed.

Also, refactor InputDevice api's to return a list of infos instead of
having to query each individually. In all usages so far, there's no need
to get a specific info by type.

Bug: 190126442
Test: atest inputflinger_tests libinput_tests
Change-Id: I7f993a14259bb802e2631663c1c8bb65cc9b6702