i965: Make brw_update_renderbuffer_surface static.

Also rename it to gen6_update_renderbuffer_surface, as this is the
function for Gen6+.  Having functions named "brw_*" and "gen4_*"
is confusing...if we're using gens, let's stick with those.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
2 files changed