ARM: dts: msm: Increase the size of snapshot for SM8150

Increase snapshot size to accommodate the preemption buffers of every
ring buffer that is dumped in the snapshot.

Change-Id: Ibb19144f6d5fee9153ff52ef7cca1d57f093d402
Signed-off-by: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>