disp: rotator: update iommu domain info during rotator probe

In 4.19 kernel, smmu driver will attach context bank soon
after device is probed. This change fixes display driver to
treat smmu context bank as pre attached.

Change-Id: Ib95abeb3c853903efb9bed3e04552278576a572a
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>