Instead of going to the V4L2 open(), use the xref to the
proper place at the frontend ioctls that were already
reformatted.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Keeping everything altogether makes harder to reorganize the
DocBook. So, move the FE_GET_INFO ioctl and the associated structures
into a separate file.

No functional changes.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>