octeontx2-bphy-netdev: disable rx on RFOEs on exit

commit e652e5e3ca5f799d405734af54a8ac7f2fd374f3 from
git@git.assembla.com:cavium/WindRiver.linux.git

When the application using netdev crashes or gets killed, the RX on RFOE
ports is not disabled. This can cause some corruption when processing
the received packets after allocated bphy resources are released.

Signed-off-by: Baha Mesleh <baha.mesleh@nokia.com>
Change-Id: Ic4cd27d1a9c054a187dfbd713e4848776036303f
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/121177
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>