ARM: dts: msm: Add DT support for sdxpoorwills v2 pcie mtp

Add device tree support for sdxpoorwills v2 pcie ep mtp board.
Also, the support for force warm reboot is being added to
these files.

Change-Id: I43ff308d3eb91c4bf0a04593f25d0a4de636554a
Signed-off-by: Shadab Naseem <snaseem@codeaurora.org>