crypto: sha-mb - SHA1 multibuffer submit and flush routines for AVX2

This patch introduces the routines used to submit and flush buffers
belonging to SHA1 crypto jobs to the SHA1 multibuffer algorithm.  It is
implemented mostly in assembly optimized with AVX2 instructions.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>