msm: ipa2: Add changes compatible to kernel-4.19

Previously deprecated smmu calls have been removed. These
changes also caused the reorganization of a key data structure
and logic.

Change-Id: Ic5ac67e64483f8cc905235a3134c342df4eab79d
Signed-off-by: Ashok Raj Deenadayalan <adeenada@codeaurora.org>