drm/atomic-helper: Reject legacy flips on a disabled pipedrm-intel-next-2015-12-04-fixed

We want this for consistency with existing page_flip semantics.

Since this spurred quite a discussion on IRC also document why we
reject even generation when the pipe is off: It's not that it's hard
to implement, but userspace has a track recording proofing that it's
way too easy to accidentally abuse and cause havoc. We want to make
sure userspace doesn't get away with that.

Cc: Daniel Stone <daniels@collabora.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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