i965/urb: Trigger upload_urb on NEW_BLORP

i965/urb: Trigger upload_urb on NEW_BLORP

It's a bit rare, but blorp can trigger a urb reconfiguration.  When
that happens, we need to re-upload the URB config.  Previoulsy blorp
would set BRW_NEW_URB_SIZE, but this is a pretty big hammer as it
would cause back-to-black blorp operations to reconfigure both times.
Using BRW_NEW_BLORP is a small, more accurate hammer.

v2 (idr): Sort BRW_NEW_ tokens to match brw_recalculate_urb_fence and
gen6_urb.

v3 (idr): Don't whack BRW_NEW_URB_SIZE in blorp.  Suggested by Jason.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>