This allows specific (non-multiplexed) IRQ handlers to be used.

Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Acked-by: NMagnus Damm <magnus.damm@gmail.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NChris Ball <cjb@laptop.org>