i965: Disassemble UV types, not UB types.
i965: Disassemble UV types, not UB types.

UB types have never been supported as immediates.  On Gen4-5, register
encoding 4 is "Reserved."  On Gen6+, it means UV.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>

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