lib/intel_io: api documentation

As usual de-inline functions for gtkdoc to see them.

I've decided to exclude the register map stuff since that's not
terribly interesting.

Aside: gtkdoc falls over when the title of a section contains a slash,
hence why it reads "IO" instead of "I/O". The fun ...

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
3 files changed