ARM: dts: imx6qdl-sabrelite: add skews for Micrel phy

Set the data delays to min, and clock delays to max
because the traces are equal length on pcb.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>