Remove frozen bounds of activity and task

Since unifying of hierarchy, the configuration of Activity and
windows are updated together. There won't be temporal inconsistent
bounds any more.
History commit: 0429f352

Also remove the update of override config even there are no changes.
Because performDisplayOverrideConfigUpdate was changed to not always
call setNewDisplayOverrideConfiguration for years. So the original
purpose of the change is gone.
History commit: c6467172

Bug: 159103089
Bug: 163976519
Test: CtsWindowManagerDeviceTestCases
Change-Id: Ie5711ab4bcff7bf572cf6410df9bc8aaa5688e11