Make TV permission dialog be unrestricted keep-clear area

This makes the PiP window be moved away from the permission dialog
when both are shown

Bug: 227596282
Test: manual: start Pip alongside a permission dialog and verify that
      the pip is moved away
Test: adb shell dumpsys package com.google.android.permissioncontroller \
        | grep android.permission.SET_UNRESTRICTED_KEEP_CLEAR_AREAS
Change-Id: I969079422ca32659e19c20273ba2209eafdd8d60