fix precision failure on tests on hd5500
fix precision failure on tests on hd5500

hughperkins/clnn,brunoro/clnn,szagoruyko/clnn,szagoruyko/clnn,brunoro/clnn,hughperkins/clnn,hughperkins/clnn,brunoro/clnn,szagoruyko/clnn,brunoro/clnn,hughperkins/clnn,szagoruyko/clnn