i965: Add missing MOCS setup for 3DSTATE_INDEX_BUFFER on Broadwell.
i965: Add missing MOCS setup for 3DSTATE_INDEX_BUFFER on Broadwell.

Somehow I missed this when adding all of the other MOCS values.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>
Cc: "10.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

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