dpaa2-eth: mark DPNIs without a DPMAC as virtual devlink ports

A DPNI whose endpoint is not a DPMAC has no physical connector: it
may have no endpoint at all, or be connected to another DPNI or to a
DPSW port. Until now, such a DPNI was still registered as a physical
devlink port with number 0, so userspace saw a physical port that does
not exist.

Register these DPNIs as virtual devlink ports instead. A virtual port
has no phys_port_name, so only the DPNIs that serve a DPMAC at probe
time report one, "p<dpmac id>", and those names do not collide.

Signed-off-by: Vincent Jardin <vjardin@free.fr>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260928-for-upstream-dpaa2_ports-v2-2-1cda148530bf@free.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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