driver:phy:macsec: MACsec SCI command corercted not to accept invalid inputs.

commit fb520f8bd99953c770b3aa54ec6323872f1d65ef from
git@git.assembla.com:cavium/WindRiver.linux.git

Fixes: 5002aeeae1e2 (Params support for SA)

Signed-off-by: Narendra Hadke <nhadke@marvell.com>
Change-Id: Ic281ce41a73f2f044e850695934796fb7c4f1b58
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/107915


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Tested-by: Devapraba Muthumani <dmuthumani@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Li Wang <li.wang@windriver.com>