display: Add support to HAL_PIXEL_FORMAT_NV21_ZSL format

Add Support to HAL_PIXEL_FORMAT_NV21_ZSL format in gralloc for
camera capture usecase.
This support is required because, CPP module requires 64 byte
aligned width and height to resolve corruption in bottom/left edge
of the landscape/portrait buffer.

Change-Id: Id3e0e5f3d695d5111f3469f78a1d52aad9bea4f4
(cherry picked from commit 512ee1dcef6fa47dfdcf3990fea29bd85f967f02)

Conflicts:
	libgralloc/gralloc_priv.h