crypto: inside-secure - Fix hang case on EIP97 with zero length input data

The EIP97 hardware cannot handle zero length input data and will (usually)
hang when presented with this anyway. This patch converts any zero length
input to a 1 byte dummy input to prevent this hanging.

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