ARM: dts: msm: Introduce smr masks for kgsl smmu for sdm855

Allow kgsl to include SMR masks into the iommus property. This
will help reduce the number of SMR registers being used up.

Change-Id: I3af9e4d5edf4ca595ce85795a8c3e3c462f578e3
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>