Rename LockscreenTargetFilter.

This change renames LockscreenTargetFilter to
LockscreenAndDreamTargetFilter, because it is now shared between both
the lockscreen and dream surfaces.

Bug: 233580657
Test: atest LockscreenAndDreamTargetFilterTest
Change-Id: Ic6998a0cdc57fb42f1d4b414ad0305d721df0180
3 files changed