ARM: dts: msm: Set offlinable memory limit and granule for sm8150

Set the memory limit that can be offlinable to 35% of the total
available RAM, with the mentioned granule size. This memory region
would be applicable for memory hot-plugging.

Change-Id: Ie4625b80230f9d11b83657e7569f5d929d9f8c92
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>