dt-bindings: net: renesas,ether: Drop undocumented "micrel,led-mode"

"micrel,led-mode" is not yet documented by a schema. It's irrelevant to
the example, so just drop it.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20241113225742.1784723-2-robh@kernel.org


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