ARM: orion5x: use node labels for UART and SATA on edmini_v2

ARM: orion5x: use node labels for UART and SATA on edmini_v2

This commit converts the existing devices described in the edmini_v2
Device Tree to use node labels: the UART and SATA device. Also, it
reorders the eth and mdio node label references to be sorted
alphabetically.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-18-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>