mfd: qcom_rpm: Drop use of IRQF_NO_SUSPEND flag

The driver handles wakeup irq correctly using irq_set_irq_wake. There's
no need to use IRQF_NO_SUSPEND while registering the interrupt.

This patch removes the use of IRQF_NO_SUSPEND flag.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>