CC312: Extend support for PKCS#1v1.5 RAW signature algorithms

Extend the low-level driver to support PKCS#1v1.5 RAW signature
algorithms, where the input is the DigestInfo structure as
specified by RFC8017 sect 9.2 and no hashing is required to be
performed (i.e. non-hashed mode). Only the CC3XX driver is able
to support this mode of operation.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: Ib4d1afb54ab2aeaab2e6826b19fb46f03f3c51eb
6 files changed