ARM: msm: convert SMP platforms to CONFIG_MULTI_IRQ_HANDLER

Convert the SMP msm platforms to be using the gic_handle_irq
function as their primary interrupt handler.

Tested-by: David Brown <davidb@codeaurora.org>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>