Revert "ARM: dts: msm: remove guard-memory region support for rmtfs on sm6150"

This reverts commit 3b6c11d3.
We need the guard-memory region workaround for sm6150,as there
is XPU partition overlapping issue still exists.

Change-Id: I401f8af7235d7db270f90a980b814fc695d35574
Signed-off-by: Ankit Jain <jankit@codeaurora.org>