pan/bi: Remove the "wrong" stores in IDVS variants

Position shaders should only write gl_Position (and gl_PointSize on
Valhall), varying shaders should only write varyings.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14154>
1 file changed