[media] em28xx: move sensor code to a separate source code file em28xx-camera.c

em28xx-cards.c is very large and the sensor/camera related code is growing,
so move this code to a separate source code file em28xx-camera.c.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/media/usb/em28xx/Makefile
Simple merge

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

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

diff --cc drivers/media/usb/em28xx/em28xx.h
Simple merge