crypto: caam - Fix STORE command to support overwriting Shared Descriptor's memory

In case Store command is used with overwrite Shared Descriptor
feature there is no need for pointer, it is using the
address from which the Shared Descriptor was fetched.

Signed-off-by: Andrei Varvara <andrei.varvara@freescale.com>
Reviewed-by: Phillips Kim-R1AAHA <Kim.Phillips@freescale.com>
Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>