ARM: dts: msm: Use same sid for apps iommu test devices for sdm670

Share the same SID value between both normal and coherent iommu
test devices. Since these devices are used in isolation, its safe
for them to run on the same SID value.

Change-Id: I3d57cdb2bbe3df86fc3860097906bc39147a15ef
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>