[media] DocBook: Add rules to auto-generate some media docbook

Auto-generate the videodev2.h.xml,frontend.h.xml and the indexes.

Some logic at the Makefile helps us to identify when a symbol is missing,
like for example:

Error: no ID for constraint linkend: V4L2-PIX-FMT-JPGL.

Change-Id: I2f828c48fac3c55102765efd71091bb9ab990601
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
4 files changed