i965/vs: set up sampler state pointer for Gen4/5.

Fixes broken filter and lod selection for vertex texturing.
(txs/txf only worked properly because they ignore the sampler state
completely)

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-stable@lists.freedesktop.org
i965/vs: Put lod parameter in the correct place for Gen4

This was never visible before due to the bogus sampler state pointer.
Fixes remaining vertex texturing breakage on Gen4.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-stable@lists.freedesktop.org