Remove prepareSurface from surface placement

Since I67e4e58aced78a2f36163178a64ca55d3c77e6f3, the pending
transaction no longer applies with surface placement.

This is similar to partially undo commit 6b0f8461. The problem
is gone with centralized transaction in WindowAnimator.

And because surface placement already always schedules a frame
to call prepareSurface, the invocation in itself becomes redundant.

Bug: 159103089
Bug: 330721336
Test: CtsWindowManagerDeviceWindow
Change-Id: I6ae097b413ce04a30968807af545f95833b16ce0