V4L/DVB (10124): em28xx: expand output formats available

Add additional output formats, which will be useful for the Pinnacle PCTV
Ultimate 880e integration with the saa7136.

Thanks to Ray Lu from Empia for providing the em2860/em2880 datasheet.

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>