drivers: crypto: add support for OCTEONTX2 CPT engine

commit 9f4c261fe3487d52b075815c27eb900f2ea4864a from
git@git.assembla.com:cavium/WindRiver.linux.git

Add support for the cryptographic acceleration unit (CPT) on
OcteonTX2 CN96XX SoC.

Change-Id: If51f55dc9af7c6c82f6da2f0a0d1d9fa5e111eb7
Signed-off-by: Srujana Challa <schalla@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/27949
Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Tested-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
[RQ: Replace kzfree() with kfree_sensitive().
 Drop most of parts which have been already applied.]
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>