gpu: nvgpu: Use nvgpu_mem instead of custom sgt

Use an nvgpu_mem created from a page in the ACR code instead of
a scatter gather table created by the Linux SGT APIs. The ACR code
needs to have the GPU map a physical page queried from an external
API (other than the regular DMA API).

Note that this code used to explicitly mark the SGT it makes as
bypassing the SMMU. However, that is now taken care of implicitly
by the __nvgpu_mem_create_from_pages() function.

JIRA NVGPU-12
JIRA NVGPU-30

Change-Id: Ie40152a7611e985e1b97ac2ddc7e27664b71917c
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1464082
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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