Crypto: Add a 256 bit key length test for AES-CTR

Add a test for AES-256-CTR to exercise a Cipher mode of AES
such as CTR but using a 256 bit key instead of 128 bit key
used as default.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: Ic59d464b92bd6bed26232afcf49cb62067359e2e
2 files changed