ARM: dts: msm: Add support for complete subsystem ramdump for msm8953/17

Add support to dump complete ramdump of subsystem from start of first
segment to end of last segment without leaving any hole in between.

Change-Id: I2d5878838f5a3898396a80419bc43a104da62c75
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>