ARM: dts: msm: update continuous splash region for sdmmagpie

Align the reserved memory region start address for continuous splash
feature on sdmmagpie to memory map v3.

Change-Id: Ifc602b4cb404280819dddb3ca4277e92326263a3
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>