drivers: irqchip: pdc: check for valid GPIO interrupts

PDC is the parent of TLMM to enable wakeup from GPIO. To achieve this,
PDC irqchip exports a irqdomain specifically for GPIOS. But not all
GPIOs are routed to the PDC. So when a driver requests a GPIO, the TLMM
driver must check in its map to see if a corresponding PDC interrupt
exits for the GPIO.

If it does, TLMM will translate to the PDC interrupt and request an
interrupt to be allocated at the PDC. If the GPIO is not mapped to a PDC
line, it still has to request the PDC to allocate an interrupt in the
irqdomain. This is necessary as PDC alloc will setup the irqchip on the
irqdomain. Failing to do so will result in an exception when calling the
_set_parent functions on the irqchip.

Set up GPIO_NO_WAKE_IRQ as the parent interrupt of a non-wakeup capable
GPIOs.

Change-Id: I58f1ed0cc6daa50aec2d40bf38c1f645619a1021
Signed-off-by: Lina Iyer <ilina@codeaurora.org>