octeontx2-af: Initialize NIX1 block

This patch modifies NIX functions to operate
with nix_hw context so that existing functions
can be used for both NIX0 and NIX1 blocks. And
the NIX blocks present in the system are initialized
during driver init and freed during exit.

Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>