When performing the copybit blit operation, do a blind blit of the
surfaces. The blending operation should be done when the stretch operation
is invoked.
Gralloc buffers which have the PRIV_FLAGS_USES_PMEM_ADSP
flag are allocated from a pmem region.
Set the kgsl memory type to PMEM to reflect this change.
Change-Id: Id5b84277ddec5cc9550aa97d2789df4d1bc2b2b5