ARM: dts: msm: Add ipc-spinlock entry for msmferrum

Add the ipc-spinlock entry to facilitate locking between apps and
non-apps processors.

CRs-Fixed: 684512
Change-Id: Id559735ee513ffa7cb81d3864a4b83c5bdbac884
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>