turnip: clean up primitive output state

We only need to emit one set of primitive output registers. This may differ
from the blob, because it seems to try to allow using the same pipeline
with tess/geom enabled/disabled.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5790>
3 files changed