Enable build with postproc if requested

Change-Id: I426683ae7727ee4d598ffdb000e391da00450e3f
hwc: Use rotator for resolution change for all display

Rotator need to be used when resolution change happens for
primary or external display to avoid flicker or page fault.

Change-Id: If4b584c7afb7d2265b1efd7c320ac76ade199b74