V4L/DVB (5377): Replace SA_* with IRQF_*

SA_* interrupt flags are being phased out, update to newer flags.
Thanks to Maarten Maathuis for pointing this out to me.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>