libmbedtls: support symmetrical ciphers

Adds support for symmetrical ciphers. The XTS mode is not supported in
mbedTLS and will be dealt with later.

Acked-by: Etienne Carriere <etienne.carriere@lin

libmbedtls: support symmetrical ciphers

Adds support for symmetrical ciphers. The XTS mode is not supported in
mbedTLS and will be dealt with later.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Edison Ai <edison.ai@arm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

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