There are legit cases, e.g. when userspace asks for something
impossible. So tune it down to debug output like we do with all other
userspace-triggerable warnings.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66111#c5Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
[danvet: Rebased.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>