net: lan966x: allow offloading timestamp operations to the PHY

In case the MAC is using 'netif_rx()' to deliver the skb up the network
stack, it needs to check whether 'skb_defer_rx_timestmap()' is necessary
or not. In case is needed then don't call 'netif_rx()'

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Link: https://lore.kernel.org/r/20220307094632.3764266-1-horatiu.vultur@microchip.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>