dt-bindings: net: fec: add fsl,s32v234-fec to compatible property

Add fsl,s32v234-fec to compatible property to support s32v234 platform.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>