gpu: ion: replace __GFP_ZERO with manual zero'ing

As a performance optimization, omit the __GFP_ZERO flag when
allocating individual pages and, instead, zero out all of the pages in
one fell swoop.

Change-Id: Ieb9a895d8792727a8a40b1e27cb1bbeae098f581
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
msm: vidc: Remove delayed unmap flag in ion_map_iommu()

This change fixes the iommu map failure in movie studio
application by removing the delayed unmap flag in
ion_map_iommu(). The delayed unmap will cause the
iommu buffer to be unmapped only when all the clients
unmap the buffer.

Change-Id: I9e226fd56fecfa292e4d77aa94b2883bcfbf6ec2
CRs-fixed: 464374
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
Merge "msm: vidc: Remove delayed unmap flag in ion_map_iommu()"
Merge "gpu: ion: replace __GFP_ZERO with manual zero'ing"