drm/doc: Document drm_file.[hc]

Well, mostly drm_file.h, and clean up all related things:

- I didnt' figure out the difference between preclose and postclose.
  The existing explanation in drm-internals.rst didn't convince me,
  since it's also really outdated - we clean up pending DRM events in
  the core nowadays. I put a FIXME in for the future.

- Another FIXME is to have a macro for default fops.

- Lots of links all around, main areas are to tie the overview in
  drm_file.c more into the callbacks in struct drm_device, and the
  other is to link render/primary node code to the right sections in
  drm-uapi.rst.

- Also moved the open/close stuff to drm_drv.h from drm-internals.rst,
  seems like the better place for that information. Since that section
  was rather outdated this amounted to full-on rewrite.

A big missing piece here is some overview graph, but I think better to
wait with that one until drm_device and drm_driver are also fully
documented.

v2: Nits from Sean.

Reviewed-by: Sean Paul <[email protected]>
Reviewed-by: Liviu Dudau <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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