Merge branch 'remove-label-cpu-from-dsa-dt-bindings'

Vladimir Oltean says:

====================
Remove label = "cpu" from DSA dt-bindings

As explained in more detail in patch 1/3, label = "cpu" is not part of
DSA's device tree bindings, yet we have some checks in the dt-schema for
mt7530 which are written as if it was.

Reformulate those checks, and remove all occurrences of this seemingly
used, but actually unused, property from the binding examples.
====================

Link: https://lore.kernel.org/r/20220912175058.280386-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>