refactor!: profiles part 4: remove CCA

Remove all CCA related code as it is moving into ccatoken.

BREAKING CHANGE: CCAPlatformClaims and related code are removed. Use
github.com/veraison/ccatoken/platform.Claims instead.

Signed-off-by: Sergei Trofimov <[email protected]>

Author: setrofim

README.md

@@ -1,10 +1,14 @@
 # Features
 
-This is a compliant implementation of three specifications:
+This is a compliant implementation of ~~three~~two specifications:
 
 * [draft-tschofenig-rats-psa-token-07](https://datatracker.ietf.org/doc/html/draft-tschofenig-rats-psa-token-07) (`PSA_IOT_PROFILE_1`), and 
 * [draft-tschofenig-rats-psa-token-09](https://datatracker.ietf.org/doc/html/draft-tschofenig-rats-psa-token-09) (`http://arm.com/psa/2.0.0`)
-* Realm Management Monitor Specificiation [RMM Spec](https://developer.arm.com/documentation/den0137/latest)
+* ~~Realm Management Monitor Specificiation [RMM Spec](https://developer.arm.com/documentation/den0137/latest)~~
+
+> [!Note]
+> Realm Management Monitor Specificiation implementation has been moved to
+> [ccatoken](github.com/veraison/ccatoken).
 
 The package exposes the following functionalities: