Crypto: Add test vectors for RFC7539

Adds two specific tests to verify Chacha20 and Chacha20-Poly1305
against test vectors available in RFC7539.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I082777bd8da7f3a41840d7ef5d2f666fb4c23eb7
4 files changed