video: tegra: nvmap: helper for reserved bit ops

video: tegra: nvmap: helper for reserved bit ops

This takes care of the following
1. On page reserve request: set reserved bit to indicate page
   is reserved
2. On page unreserve request: reset the reserved bit.

Bug 1444151

Change-Id: I0920af9a8eb538a84c8b3520b383276c7a28d74b
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/377862
(cherry picked from commit 3308000d6a3a8133e00d41ca1532f1b1e2eee0bb)
Reviewed-on: http://git-master/r/405140
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>