ARM: dts: msm: Add support for complete subsystem ramdump for SM6150

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

Change-Id: I7271d1d22c3ac203c03ab578626c07834b48c061
Signed-off-by: Jitendra Sharma <shajit@codeaurora.org>