ARM: dts: msm: Add hard reset property for MSM8937

There is risk that system will not boot up when device is
rebooting with warm reset. So enable the DT property to set
the hard reset register's offset for MSM8937.

Change-Id: If158c525167c9426432013260815bf7816fa70f7
Signed-off-by: Lijuan Gao <lijuang@codeaurora.org>