dt-bindings: net: dsa: update the description of 'dsa,member' property

The current description indicates that the 'dsa,member' property cannot
be set for a switch that is not part of any cluster. Vladimir thinks
that this is a case where the actual technical limitation was poorly
transposed into words when this restriction was first documented, in
commit 8c5ad1d6179d ("net: dsa: Document new binding").

The true technical limitation is that many DSA tagging protocols are
topology-unaware, and always call dsa_conduit_find_user() with a
switch_id of 0. Specifying a custom "dsa,member" property with a
non-zero switch_id would break them.

Therefore, for topology-aware switches, it is fine to specify this
property for them, even if they are not part of any cluster. Our NETC
switch is a good example which is topology-aware, the switch_id is
carried in the switch tag, but the switch_id 0 is reserved for VEPA
switch and cannot be used, so we need to use this property to assign
a non-zero switch_id for it.

Suggested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260518082506.1318236-2-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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