ARM: mvebu: Add proper pin muxing on Globalscale Mirabox board

ARM: mvebu: Add proper pin muxing on Globalscale Mirabox board

This commit adds the required pin muxing for the network interfaces and
the MDIO interface to be properly initialized. For instance, this makes
it possible for a bootloader to initialize and access the network interfaces.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1407759281-11513-3-git-send-email-ezequiel.garcia@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>