Added support for the SM3 ahash algorithm

changes since v1:
- moved definition of CONTEXT_CONTROL_CRYPTO_ALG_SM3 (0x7) up above 0xf

changes since v2:
- allow compilation if CONFIG_CRYPTO_SM3 is not set
Acked-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>