drivers: irqchip: pdc: setup all edge interrupts as rising edge at GIC

The PDC irqchp can convert a falling edge or level low interrupt to a
rising edge or level high interrupt at the GIC. We just need to setup
the GIC correctly. Set up the interrupt type for the IRQ_TYPE_EDGE_BOTH
as IRQ_TYPE_EDGE_RISING at the GIC.

Change-Id: Ia1852d24072ef8d0c932fa9383e9c877766a386a
Reported-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>