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
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30427

(cherry picked from commit 602e4e433d3e7dbb03d4fd30a4720a02cdeca6aa)