[media] altera-ci.h: add missing inline

Functions defined in a header should be static inline. This prevents
compile warnings like:

	'altera_ci_tuner_reset' defined but not used

(Actually appeared in the media backwards compatibility build).

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>