ARM: dts: msm: Enable SPMI Wakeup interrupts on MSM8994

MPM driver is now validated and SPMI interrupts need to be setup as wakeup
sources.
Remove the flag that was preventing the interrupts from being setup as
wakeup sources.

Change-Id: I2d745fd8978518aaf6dc366654d022ea5fc2c763
Signed-off-by: Karthik Parsha <kparsha@codeaurora.org>