ARM: dts: imx35: correct node name for FEC

Correct node name for FEC which found when do dtbs_check.

$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/net/fsl,fec.yaml
arch/arm/boot/dts/imx35-eukrea-mbimxsd35-baseboard.dt.yaml: fec@50038000: $nodename:0: 'fec@50038000' does not match '^ethernet(@.*)?$'
arch/arm/boot/dts/imx35-pdk.dt.yaml: fec@50038000: $nodename:0: 'fec@50038000' does not match '^ethernet(@.*)?$'

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>