ARM: dts: msm: add memory region info for early splash feature

on msm8996

These two memory regions are for the memory nodes which early
animation/static display will visit. Both are needed to be
processed in kernel handoff sequence.

Change-Id: I36a9b3dcc6b905af4bb8383cfbd1555e8e9bd417
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>