i965: Make brw_update_sampler_state use 8 bits for LOD fields on Gen7+.
i965: Make brw_update_sampler_state use 8 bits for LOD fields on Gen7+.

This was the only actual difference between Gen4-6 and Gen7+ in terms of
the values we program.  The rest was just mechanical structure
rearrangement.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Topi Pohjolainen <749697f19798b7f640b17221fd283b903825f071@intel.com>

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