nv30: fix clip plane uploads and enable changes

nv30: fix clip plane uploads and enable changes

nv30_validate_clip depends on the rasterizer state. Also we should
upload all the new clip planes on change since next time the plane data
won't have changed, but the enables might.

This fixes fixed-clip-enables and vs-clip-vertex-enables shader tests.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Cc: "10.5 10.6" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 7518fc3c66e9b5703b987bccca7970a344deadfa)