media: rc: new driver for early iMon device

These devices were supported by the lirc_imon.c driver which was removed
from staging in commit f41003a2 ("[media] staging: lirc_imon: port
remaining usb ids to imon and remove").

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>