Move TV PiP away from keep clear areas

The PiP is placed in a way to avoid keep clear areas.
If no areas overlapping the default PiP anchor position are defined,
the PiP will stay at its anchor position.
Otherwise, it will try to move to a free location closest to its anchor
position. Unrestricted areas can cause the PiP to move across the entire
screen, but restricted areas have limited influence and can only move
the PiP a short distance.
If no free position is found, the PiP will be stashed for some time.
To find the position to move to once the PiP unstashes, a relaxed search
is performed, excluding a restricted keep clear area. If this still does
not yield a position to move to, only unrestricted areas will be taken
into account. The PiP is stashed along the edge closest to the unstash
position.

Bug: 218416347
Bug: 218494300
Test: atest TvPipKeepClearAlgorithmTest
Change-Id: I76c6527320fc403bb604b188f38eed505eeaab89