net: macb: Enable PTP unicast

[ Upstream commit ee4e92c2

 ]

Enable transmission and reception of PTP unicast packets by
updating PTP unicast config bit and setting current HW mac
address as allowed address in PTP unicast filter registers.

Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 403f0e77

 ("net: macb: fix sleep inside spinlock")
Signed-off-by: Sasha Levin <sashal@kernel.org>