video: tegra: nvmap: clean cache during page allocations into page pool

video: tegra: nvmap: clean cache during page allocations into page pool

Clean cache during page allocations into page pool to
avoid cache clean overhead at the time of allocation.
Increase page pool refill size to 1MB from 512KB.

Bug 1539190

Change-Id: I6c45782e54879541f7b518bbbb016383b24e376b
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/453197
Reviewed-by: Sri Krishna Chowdary <schowdary@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Michael I Gold <gold@nvidia.com>
[ccross: moved on top of background zeroing patches, replaced
 atomic with bool since it has to be protected by a lock anyways]
Signed-off-by: Colin Cross <ccross@android.com>
Reviewed-on: http://git-master/r/664676
Reviewed-on: http://git-master/r/736430
Tested-by: Alex Waterman <alexw@nvidia.com>