msm: kgsl: Add support for OCMEM

OCMEM is a on-chip memory bank which is shared by all Multimedia
components. KGSL needs to request space for GMEM usage for platforms
that support OCMEM.

Change-Id: Ic3ff501d7a444a71f75244806af95c62c8a08ed8
Signed-off-by: liu zhong <zhongl@codeaurora.org>

Conflicts:
	drivers/gpu/msm/adreno.c