Some more VC4 vblank fixes and timestamping improvements.

[Eric Anholt]

Mario Kleiner <mario.kleiner.de at gmail.com> writes:

> Hi Eric and all,
>
> this batch prevents setting modes one shouldn't set,
> adds precise vblank timestamping for interlaced video
> modes, and one fix for vblank en/disable during crtc
> en/disable.
>
> All successfully tested, also with timing measurement equipment,
> on the RPi 2B.

I finally got around to making new -next branches, and pulled all of
these to drm-vc4-next.  Thanks!
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