Auto unstash PiP

- We do not support stashing on an edge with display cutouts
- Upon display change, unstash if it's going to be on that edge

Flag: EXEMPT bugfix
Bug: 316267224
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/bJQ9n66tM2F496xoyqsX5s
Test: Rotation display with stashed PiP, see Video
Change-Id: I761404ad4e61e98cea47e5386c99e244f3fd8d74