Merge branch 'media-uapi' into docs-mw

Merge branch 'media-uapi' into docs-mw

Mauro says:

In the past, media used Docbook to generate documentation, together
with some logic to ensure that cross-references would match the
actual defined uAPI.

The rationale is that we wanted to automatically check for uAPI
documentation gaps.

The same logic was migrated to Sphinx. Back then, broken links
were reported. However, recent versions of it and/or changes at
conf.py disabled such checks.

The result is that several symbols are now not cross-referenced,
and we don't get warnings anymore when something breaks.

This series consist on 2 parts:

Part 1: extra patches to parse_data_structs.py and kernel_include.py;
Part 2: media documentation fixes.