dpaa2-switch: extend the FDB management to cover bond scenarios

The dpaa2_switch_fdb_for_join() function is responsible with determining
what FDB should be used by a port as a consequence of it joining a
bridge. The rule is that all DPAA2 switch ports under the same bridge
will use the FDB of the first port which joined that bridge. Extend the
function so that the function also covers the scenario in which there is
bridged bond device.

For this to happen, in case a bond device is encountered through the
bridge ports the function needs to descend one level through its lowers
as well.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://patch.msgid.link/20260629112309.154328-4-ioana.ciornei@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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