Lirc: Enable IR-Blasting support

Hi,

This Enables IR-Blasting in kernel, doing this will create the /dev/lircX devices that triggers lircd to start.

I have changed the lircd_helper script to only start lircd if a lircd.conf exist, so it dont take extra resources or cause interference with eventlircd...

This makes it possible to use a MCE Transceiver with lircd to blast IR commands to a TV or other external IR devices.