iommu: msm: Remove redundant version check

We no longer select SMMUv0 and SMMUv1 driver together for
compilation. So, this check becomes redundant. Remove it.

Change-Id: I4e957c5e864a89eb1620c31cea7b02b0385e3238
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>