arm/dt: IOMMU: Add missing MDP context bank

MDP has a total of 3 context banks.
Add missing MDP context bank for MDP IOMMU.

Change-Id: I76e9d5014ba90f524185cf2200d45c8e44f81c8d
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
1 file changed