octeontx2-af: add mbox to configure SSO group mask

commit 7915ed5debd6a24da8f1f22b4466ec3c00593a0d from
git@git.assembla.com:cavium/WindRiver.linux.git

Add mbox to configure SSO HWGRP membership for a given SSO HWS.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Change-Id: I31254b55e17cd6ba0f87bc8e8eea434718a4d78a
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/71181
Reviewed-by: Shijith Thotton <sthotton@marvell.com>
Reviewed-by: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Tested-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
(cherry picked from commit 0543c3b122b69dc5138c175fd950ab38e384574e)
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/71305
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>