dpaa2-switch: add support for LAG offload

This patch adds the bulk of the changes needed in order to support
offloading of an upper bond device.

First of all, handling of the NETDEV_CHANGEUPPER and
NETDEV_PRECHANGEUPPER events is extended so that the driver is capable
to handle joining or leaving an upper bond device.
All the restrictions around the LAG offload support are added in the
newly added dpaa2_switch_pre_lag_join() function.

The same events are extended to also detect if one of our upper bond
devices changes its own upper device. In this case, on each lower device
that is DPAA2 the corresponding dpaa2_switch_port_[pre]changeupper()
function will be called. This will start the process of joining the same
FDB as the one used by the bridge device.

Setting the 'offload_fwd_mark' field on the skbs is also extended to be
setup not only when the port is under a bridge but also under a bond
device that is offloaded.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://patch.msgid.link/20260629112309.154328-10-ioana.ciornei@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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