video: tegra: nvmap: don't count shared memory in full

video: tegra: nvmap: don't count shared memory in full

Don't count shared memory in full in iovmm stats.
Add SHARE field to allocations info to show how many
processes are sharing the handle.
Update few comments in the code.
Remove unnecessary iovm_commit accounting.

Bug 1529015

Change-Id: I49650bf081d652dedc7139f639aae6da06965ecd
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/426274
(cherry picked from commit 92d47c10fbf7a315d4c953bafb71ee23032b7f65)
Reviewed-on: http://git-master/r/448533
Tested-by: Winnie Hsu <whsu@nvidia.com>