mesa/st: fix formats required for EXT_texture_norm16
Earlier commit did not take in to account that lists required for rendering and texturing are parsed separately. This commit requires both lists to toggle the extension bit on, not just one of them.
Fixes: de4eb9a3 ("mesa/st: toggle EXT_texture_norm16 based on format support") Signed-off-by: Tapani Pälli tapani.palli@intel.com