irqchip/qcom-pdc: Update max PDC interrupts

Newer SoCs have increased the number of interrupts routed to the PDC
interrupt controller. Update the definition of max PDC interrupts.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1573855915-9841-3-git-send-email-ilina@codeaurora.org