KEYS: trusted: caam based protected key

- CAAM supports two types of protected keys:
  -- Plain key encrypted with ECB
  -- Plain key encrypted with CCM
  Due to robustness, default encryption used for protected key is CCM.

- Generate protected key blob and add it to trusted key payload.
  This is done as part of sealing operation, which is triggered
  when below two operations are requested:
  -- new key generation
  -- load key,

Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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