video: tegra: nvmap: Export symbols

video: tegra: nvmap: Export symbols

nvmap stores some buffer specific parameters and it already
allows accessing those parameters. This patch modifies nvmap
so that the parameters can be read also from drivers that are
compiled as modules.

Bug 1476801

Change-Id: Idfd51e25c85f8fe85891cb0df25d53f0695da401
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/387609
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>