nvc0: do not bind input params at compute state init on Fermi

nvc0: do not bind input params at compute state init on Fermi

It looks like binding a constant buffer on compute overwrites the 3D
state. To avoid that, we already re-bind all the 3D constant buffers
after launching a compute grid but this is not enough.

Binding the constant buffer of input parameters for the compute state at
initialization corrupts the 3D constant buffers, and it's just useless
to bind it because this is not needed until we really launch a grid.

This fixes some piglit regressions related to interpolation tests
introduced in "nvc0: enable compute support by default on Fermi".

Fixes: 00d6186 (nvc0: enable compute support by default on Fermi)
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>