COSE: Implement Short Circuit option in COSE_Mac0

Add a flag T_COSE_OPT_SHORT_CIRCUIT_TAG to control the Short
Circuit tagging in COSE_Mac0.
Implement Short Circuit tag generation and verification.
Skip kid parameter in COSE_Mac0 if Short Circuit is enabled.
Add decoding routine for Short Circuit option in COSE_Mac0.

Change-Id: I6fe0d797ea7646848c00d8a3fec9de97925ff4dc
Signed-off-by: David Hu <david.hu@arm.com>
7 files changed