ARM64: dt: tegra: Extend GPU IOVA space to 16 GB

ARM64: dt: tegra: Extend GPU IOVA space to 16 GB

Set GPU IOVA address space upper limit to 16GB to
avoid iova allocation failure for some use cases.

Bug 1483482

Change-Id: I5608586bc5366718694da82eef0d92edff6d8b26
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Reviewed-on: http://git-master/r/591520
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vandana Salve <vsalve@nvidia.com>
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>