V4L/DVB (4881): budget-ci IR: add IR debugging information

This adds a ir_debug parameter which is useful in tracking down
IR decoding problems.
Based on Darren Salt's dvb-ir patchset.

Signed-off-by: Darren Salt <linux@youmustbejoking.demon.co.uk>
Signed-off-by: David Hardeman <david@hardeman.nu>
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>