ARM: dts: msm: Add memory hole information to device tree

Update device tree for msm_samarium with start and size of
the memory hole to be removed by the kernel. This memory is
used by the other subsystems.

Change-Id: Ie4f7b68b5221932298f1474cc5980e5f77d88142
Signed-off-by: Neeti Desai <neetid@codeaurora.org>