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For some keys there exists an alternative but usually slower
path to convert the key material into a protected key.
This patch introduces a new handler function
  slowpath_key_to_protkey()
which provides this alternate path for the CCA and EP11
handler code. With that even the knowledge about how
and when this can be used within the pkey API code can
be removed. So now the pkey API just tries the primary
way and if that fails simple tries the alternative way.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>