MX6QDL_PAD_EIM_D23__GPIO3_IO23 pin is used to reset the ethernet phy.

Add it to the 'hog' group.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>