Move PipMediaController from pip/phone/ to pip/

Move PipMediaContoller from com.android.wm.shell.pip.phone to
com.android.wm.shell.pip.
Since PipMediaController relies on the PipUtils, move that along.

Bug: 169575409
Bug: 165795012
Test: make WindowManager-Shell
Change-Id: Ide2dfd813eb8df906b58f50e1ed9b57a62d63dbc
10 files changed