msm: mpm-of: set wakeup interrupt as NO_SUSPEND

The MPM wakeup interrupt is used to wakeup the Apps processor from
a system wide low power mode when the GIC isn't operational.

The MPM interrupt is configured as a wakeup interrupt by calling into
irq_set_irq_wake().It also needs to be configured with the
IRQF_NO_SUSPEND to prevent the irq from getting disabled during
suspend_device_irqs() in the suspend path. The interrupt is not
re-enabled until after gic_suspend() is executed as a part of the
syscore_suspend() callback.

If the CPU's idle thread enters RPM assisted power collapse between
suspend_device_irqs() and syscore_suspend, the masking of the RPM wakeup
interrupt could prevent wakeup by RPM.

CRs-fixed: 626508
Change-Id: I0d5f0d7277774ddef6817eac10156f92174ec15f
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>