ARM: dts: msm: Add remote spinlock configuration on msmskunk

Add new entry in device tree to enable remote spinlocks. The remote
spinlocks provide a synchronization mechanism for remote processors.

CRs-Fixed: 1059650
Change-Id: I63f0f9249f6e4f901f85d73eacd436384267a8f9
Signed-off-by: Chris Lew <clew@codeaurora.org>