i965: Make intel_set_texture_region just take a BO and pitch.
i965: Make intel_set_texture_region just take a BO and pitch.

I want to do this to get the region removed from DRI images.  However, it
does mean that we won't share the intel_region between the rb and the
texture for texture_from_pixmap.  I think that's fine.

Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

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