LinuxKPI: add irq_set_affinity_hint()

Add an implementation for irq_set_affinity_hint() to linux/interrupt.h
and include linux/hardirq.h for synchronize_irq() as needed by
wireless drivers.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30427