ARM: dts: msm: Add EMAC node for auto platform

Add pinctrl settings for emac related gpios.

Change-Id: Ic7ecfbab68c245aca8d2d9bfa6c9bb7a68bd5310
Acked-by: Nisha Menon <nmenon@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>