ARM: dts: msm: add ipc-spinlock device in fsm9900

Use sfpb as default remote spinlock as ldrex is not supported
by all the cores in FSM9900 chipset.

Change-Id: I601231ae01709638da5fd8729843c13f2d8b7672
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Venkatesh Yadav Abbarapu <quicvenkat@codeaurora.org>