powerpc/85xx: Add magic-packet properties for etsec

The properties indicates that the hardware supports waking up via magic
packet.

Signed-off-by: Xie Xiaobo <X.Xie@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

powerpc/85xx: create dts components to build up an SoC

Introduce some common components that we can utilize to build up the
various PQ3/85xx device trees.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>