V4L/DVB (11977): em28xx: Add Kworld 315 entry

Added an entry for Kworld 315 (for while, dvb only)

Signed-off-by: Franklin Meng <fmeng2002@yahoo.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>