crypto/nx: Add nx842_add_coprocs_list function

Updating coprocessor list is moved to nx842_add_coprocs_list().
This function will be used for both icswx and VAS functions.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>