ARM: mvebu: Add network pin mux configuration for the Armada 370 SoC

ARM: mvebu: Add network pin mux configuration for the Armada 370 SoC

This commit adds the pin mux configuration for the two network interfaces
and the MDIO interface in the Armada 370 SoC .dtsi file. Only the
configuration for RGMII is added for now.

Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1407759281-11513-2-git-send-email-ezequiel.garcia@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>