ARM : dts: msm: Enable the wake-up capability of SPMI on 8909

As RPM based wake-up support is now enabled on 8909, make SPMI
based interrupts wakeup capable.

Change-Id: I6e7d638a3c0f0f8ad01967b26682c3a54a9a2000
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>