core: LTC: conditionally enable SHA-3 implementation

Enables SHA-3 implementation in libtomcrypt and add OP-TEE wrappers.

Adds LTC fallback for mbedtls configurations since mbedtls doesn't
support

core: LTC: conditionally enable SHA-3 implementation

Enables SHA-3 implementation in libtomcrypt and add OP-TEE wrappers.

Adds LTC fallback for mbedtls configurations since mbedtls doesn't
support SHA-3 yet.

Implementation of the crypto_hmac_*_alloc_ctx() functions is updated to
only add a full implementation if the corresponding hash function also
is configured.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

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