[PiP2] Deprecate PipMenuIconsAlgorithm

PipMenuIconsAlgorithm was introduced for ARC to adjust the PiP menu
layout upon bounds change, which is no longer valid. Clean it up for
pip2 refactoring.

Flag: EXEMPT cleanup
Bug: 376099167
Test: m -j SystemUIGoogle
Change-Id: Ic26492a17fac738c1785c46271216aa1165e4a98