[media] v4l2-common.h: Add documentation for other functions

Not all functions at v4l2-common.h are documented. Add
documentation for some other ones.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-21 12:26:04 -03:00
commit b871915893