Minor update of Chacha20 to avoid being higher order
Minor update of Chacha20 to avoid being higher order

mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star