Revert "iommu: Add gfp parameter to iommu_ops::map"

This reverts commit fe4d7086 which is
commit 781ca2de89bae1b1d2c96df9ef33e9a324415995 upstream.

It breaks the Android kernel api and was added only because a RDMA/IB
change needed it, which is not needed for Android systems at all, so it
is safe to revert.

Bug: 161946584
Change-Id: I64d05d14206bd40c6453035833df3209c0c5e1b9
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>