Extend Eat to have the additional claims in EatCWTClaim

[SabreenKaur]

Currently ConciseTaStore depends on EatCWTClaim where EatCWTClaim had four additional fields needed in this context. The four additional fields are named: HardwareModelLabel, HardwareVersionScheme, SoftwareNameLabel, SoftwareVersionScheme.

The original Eat{} situated in veraison/eat, should be extended to include these four additional fields and EatCWTClaim should be made obsolete. This will result in ConciseTaStore depending on the original Eat{} object in veraison/eat

[thomas-fossati]

See also veraison/eat#21