Revert "arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable"

This reverts commit cf378015.

This is a preparation change for merging android-4.14 commit
acd501ff into msm-4.14 branch.
The reverted delta is committed already via:

b136fd59 arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable

Change-Id: I9d7e4427f5b09bbcc5e9cc95948b6863588d1865
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>