dt-bindings: net: convert lpc-eth.txt yaml format

Convert lpc-eth.txt yaml format.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250624202028.2516257-1-Frank.Li@nxp.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>