hwc: reset overlay and writeback in unblank if writeback is active

Writeback might be re-initialized after primary is blanked, kernel might
enter suspend afterwards, reset overlay and writeback at primary unblanking
so that kernel and user space are in sync.

Change-Id: I0bbfbbb2c038bb721f7c5a6b901438fdc767dc97
Bug: 16576263
Acked-by: Ken Zhang <kenz@codeaurora.org>
(cherry picked from commit d4c34611ad6538ff7acf8f253c2dc63fa70f8b66)
1 file changed