gallium: give vertex-shader saturate its own cap

Shader Model 3.0 is a big promise to make to the state-tracker, and
for instance mobile hardware might support vertex-shader saturate but
not some of the other features of SM3. So let's give this its own cap
for simplicity.

Signed-off-by: Erik Faye-Lund <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

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