LinuxKPI: Run irq_work callbacks under RCU protectionHEADmain

Linux executes irq_work callbacks from an interrupt context that
provides implicit RCU read-side protection. LinuxKPI dispatches these
callbacks through a taskqueue, so provide equivalent protection
explicitly.

This prevents an RCU grace period from completing while an irq_work
callback is still using an RCU-protected object.

Suggested by:	wulf
Tested by:	JustAnotherHumanBeing
Signed-off-by:	JustAnotherHumanBeing <oleglelchuk@gmail.com>
Pull Request:	https://github.com/freebsd/freebsd-src/pull/2385

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