Right now clear is already being done in SF using GPU for
HWC_BLIT layers, no need to clear layers a second time.
Change-Id: Ie6ed6a2e7ad3b24fae6e6bfd81988c604f07eac1
For copybit cases we should clear wormhole region
rather than nonwormhole. Adding support to calculate
and clear the same.
Change-Id: Ie85d1b484174199e35f43ce95b30de1fac9c30b2