dt-bindings: net: ethernet-controller: Fix grammar in comment

"difference" is a noun, so "sufficient" is an adjective without "ly".

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250923-dt-net-typo-v1-1-08e1bdd14c74@posteo.net


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