i965/blorp: Add an isl_view to blorp_surface_info

i965/blorp: Add an isl_view to blorp_surface_info

Eventually, this will be the actual view that gets passed into isl to
create the surface state.  For now, we just use it for the format and the
swizzle.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>