crypto: inside-secure - let HW deal with initial hash digest

The driver was loading the initial digest for hash operations into
the hardware explicitly, but this is not needed as the hardware can
handle that by itself, which is more efficient and avoids any context
record coherence issues.

Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>