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.

Change-Id: I49650bf081d652dedc7139f639aae6da06965ecd
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/426274
Reviewed-by: Sri Krishna Chowdary <schowdary@nvidia.com>