ARM : dts: msm: Enable the wake-up capability of SPMI on msm8937

As RPM based wake-up support is now enabled on msm8937, make SPMI
based interrupts wakeup capable.

Change-Id: I3c60b5b068c163b280d6410704c2a1067702336b
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>