i965: Move color rendering to the new resolve functions

i965: Move color rendering to the new resolve functions

This also removes an unneeded brw_render_cache_set_check_flush() call.
We were calling it in the case where the surface got resolved to satisfy
the flushing requirements around resolves.  However, blorp now does this
itself, so the extra is just redundant.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Chad Versace <chadversary@chromium.org>