pinctrl-msm: Add irq_set_wake support to msmgpio-dc irqchip

GIC driver started supporting irq_set_wake call and stores
wakeup capable irq in wakeup_irqs with commit
fc8e11b2("irqchip/gic-v2: implement suspend and resume").

Since Direct connector irqchip is currently not forwarding
irq_set_wake calls to its parent PDC, device is not able to
wake up from suspend since no wakeup capable direct connect
gpio irqs get forwarded to GIC from PDC, no wakeup capable IRQ
is present in GIC's wakeup_irqs.

Add support in msmgpio-dc irq_chip to forward irq_set_wake calls
to its parent PDC to resolve this.

Change-Id: I02f62ab2b5ee14ee2b7113e2732f4f25a5b18cb7
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>