irqchip: msm: Add dummy init pinctrl irqchip

Pinctrl irqchip can be a parent irqchip. So add the dummy
initialization as parent for msm8962, msmthorium
and msmtitanium SoCs.

Change-Id: I3d44f4c416bc369d24b3f399b64f15552d306bba
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>