msm: kgsl: Drop SMMUv1 support

We haven't had any targets that use SMMUv1 for quite a while and it
isn't likely that we will ever release a target that will need it
again.

Change-Id: Ic0dedbad8e04e27bb9c5a4c833736a2106c36025
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>