video: tegra: host: Support multiple mem types

Support multiple memory handle types.

Change-Id: Ieae49d93be88616dde2498da98c66671cb3090a3
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/135085
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>