i965: increase BRW_MAX_UBO to 16

The new limit is legit and it's for virgl to not regress guest desktop
GL version advertised.

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17608>
1 file changed