video: tegra: dc: initialize cursor registers

video: tegra: dc: initialize cursor registers

Cursor registers have no default state. Initialize to useful defaults.

Bug 1486452
Bug 200006001

Change-Id: Iaf07bdd2c8d40ef1bae881da68a809d335a0377f
Signed-off-by: Jon Mayo <jmayo@nvidia.com>
Reviewed-on: http://git-master/r/407682
(cherry picked from commit 4ded39f37b849849ebca44ab46e2762d71872102)
Reviewed-on: http://git-master/r/413477
Reviewed-by: Michael I Gold <gold@nvidia.com>
Tested-by: Michael I Gold <gold@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User