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: I046289f5e4b52986f477890663bbc7b2cda76c25
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/453197
(cherry picked from commit 39b0d737566adca113baac1de61f6550634da4ea)
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Reviewed-on: http://git-master/r/456768
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>