[media] em28xx: prevent registering wrong interfaces for audio-only

A few devices (em2860) use a separate interface for audio only
Audio Vendor Class USB. That interface should not be used by
Remote Controller, Analog TV or Digital TV.

Prevents initializing all non-audio extensions for the audio
only interface.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/usb/em28xx/em28xx-dvb.c
Simple merge

diff --cc drivers/media/usb/em28xx/em28xx-input.c
Simple merge

diff --cc drivers/media/usb/em28xx/em28xx-video.c
Simple merge