genirq: Use irq_set_affinity_locked to change irq affinity

Currently PM QoS is not getting notifications if irq affinity
is changed by core isolation with irq_do_set_affinity.

Use irq_set_affinity_locked instead to get notifications when
updating affinity.

Change-Id: Iab745a23637d9353f730ca77ac7e92cf61b1bf67
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>