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 simply
removes formats added to the other list.

Fixes: de4eb9a3 ("mesa/st: toggle EXT_texture_norm16 based on format support")
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Tested-by: Marge Bot <!3961>
Part-of: <!3961>
39 jobs for master in 15 minutes and 42 seconds (queued for 4 seconds)
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