dt-bindings: net: Convert Marvell Armada NETA and BM to DT schema

Convert Marvell Armada NETA Ethernet Controller and Buffer Manager
bindings to schema. It is a straight forward conversion.

Link: https://lore.kernel.org/r/20250702222626.2761199-1-robh@kernel.org


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>