feat(rss): set the signer-ID in the RSS metadata

Calculate a hash of the public key and put that into the signer-ID
field of the relevant RSS metadata. The signer-ID metadata is mandatory
in the Arm CCA attestation scheme.

Change-Id: Ic846d8bf882cfea8581d3523a3461c919462df30
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
2 files changed