Fix build errors in cobalt driver when CONFIG_SND is not enabled.
Fixes these build errors:

ERROR: "snd_pcm_period_elapsed" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "_snd_pcm_stream_lock_irqsave" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_pcm_hw_constraint_integer" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_pcm_set_ops" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_pcm_stream_unlock_irqrestore" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_pcm_lib_ioctl" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_card_new" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_card_free" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_card_register" [drivers/media/pci/cobalt/cobalt.ko] undefined!
ERROR: "snd_pcm_new" [drivers/media/pci/cobalt/cobalt.ko] undefined!
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc:	Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The adv7604 driver depends on GPIOLIB, and therefore cobalt depends
on it as well.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The cobalt device is a PCIe card with 4 HDMI inputs (adv7604) and a
connector that can be used to hook up an adv7511 transmitter or an
adv7842 receiver daughterboard.

This device is used within Cisco but is sadly not available outside
of Cisco. Nevertheless it is a very interesting driver that can serve
as an example of how to support HDMI hardware and how to use the popular
adv devices.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>