net: add a reference to MACsec ops in net_device

This patch adds a reference to MACsec ops to the net_device structure,
allowing net device drivers to implement offloading operations for
MACsec.

Change-Id: Iedaffed5dbf005a89a5b79030d1165f1019dd33f
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Mark Starovoytov <mstarovoitov@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: 30e9bb8472f4454d0544020574bb03d96ffa0e52
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[quic_adamodar@quicinc.com: Fix trivial merge conflicts]
Signed-off-by: Akshaya Damodaran <quic_adamodar@quicinc.com>