video: tegra: nvmap: clean dcache on write back op

video: tegra: nvmap: clean dcache on write back op

inner_clean_cache_all has been flushing dcache although
only clean is sufficient. Hence, call __clean_dcache_all
to clean the dcache and avoid overhead of invalidation.

Bug 1489709

Change-Id: Iaba8c117a96cd2fafceb3d9584e97ad4f9702eb3
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Reviewed-on: http://git-master/r/390072
(cherry picked from commit d80f731dde87aff64e1557d8b8c9f656421110dd)
Reviewed-on: http://git-master/r/405092
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>