drivers: pinctrl: msm: Support pinctrl as hierarchy irq domain

Newer kernel version does not support the arch_extensions that was used
earlier to forward gpio and gic interrupts to SOC specific platform
device that ensured wakeup from system sleep during idle/suspend
scenarios.

In order to support this system wakeup on msm targets, add pinctonrol
as hierarchy irq domain. This way gpios are forwarded to its parent,
allowing correct wake gpios to be configured before system enter sleeps.

Change-Id: I5e4343d376b5df3e8e0d1a5d95f198616f2059a4
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org>