linux-phytec-fsl

[media] doc-rst: do cross-references between header and the doc

Now that the LIRC header was added, we can cross-reference it
and identify the documentation gaps.

There are lots of stuff missing there, but at least now we
can avoid the gap to increase.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>