crypto/nx: Create nx842_configure_crb function

crypto/nx: Create nx842_configure_crb function

BugLink: http://bugs.launchpad.net/bugs/1718292
Configure CRB is moved to nx842_configure_crb() so that it can
be used for icswx and VAS exec functions. VAS function will be
added later with P9 support.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
(cherry picked from commit 56c10d5ea68b9a1425df0dedbe5d2710cc7d8bfa)
Signed-off-by: Gustavo Walbon <gwalbon@linux.vnet.ibm.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>