ibmvnic: Refresh device multicast list after reset

ibmvnic: Refresh device multicast list after reset

BugLink: https://bugs.launchpad.net/bugs/1839036
[ Upstream commit be32a24372cf162e825332da1a7ccef058d4f20b ]

It was observed that multicast packets were no longer received after
a device reset.  The fix is to resend the current multicast list to
the backing device after recovery.

Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>