video: tegra: nvmap: cleanup redundant functions

video: tegra: nvmap: cleanup redundant functions

Removed redundant function unmarshal_user_id() and replaced it with
unmarshal_user_handle() which it internally calls without any other
changes.

Bug 1553082

Change-Id: I7d998966c593f11a3322b0503ef11311fc1ae5e7
Signed-off-by: Maneet Singh <mmaneetsingh@nvidia.com>
Reviewed-on: http://git-master/r/498103
(cherry picked from commit 4880b6c2bdf5b10e4a71b5b79e7878343b9e7e3b)
Reviewed-on: http://git-master/r/556842
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Tested-by: Mitch Luban <mluban@nvidia.com>