dri2: Add token for DRI2BufferHiz
dri2: Add token for DRI2BufferHiz

CC: Ian Romanick <83437f65a0bd3859f1a0a8228c63010af80a82d4@freedesktop.org>
CC: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>
Acked-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Signed-off-by: Chad Versace <c34c009102e60d77975598e1f414f8a701c22d0b@chad-versace.us>

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