driver: soc: marvell: phy7121p MACsec

commit eae38f803ce1f2e181e3429d15cb4f3ba65dcdea from
git@git.assembla.com:cavium/WindRiver.linux.git

- Added optional sci
- Added support to create multiple SA
- Added support to create multiple vports

Signed-off-by: Narendra Hadke <nhadke@marvell.com>
Change-Id: I191e72ecdf736d7b500c38d5493d72b3734e8988
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/87596


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Srikanth Pidugu <spidugu@cavium.com>
Signed-off-by: Beniamin Sandu <beniamin.sandu@windriver.com>