icsf: add token-specific functions to de/encrypt data

Add the token-specific functions related to the following PKCS#11
functions:

 - C_EncryptInit()
 - C_Encrypt()
 - C_EncryptUpdate()
 - C_EncryptFinal()
 - C_DecryptInit()
 - C_Decrypt()
 - C_DecryptUpdate()
 - C_DecryptFinal()

Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>