msm: emac: Add Wake-on-LAN support

This change configures external PHY AT803X to
detect the magic packet during system suspend state.
On receiving magic packet external PHY will wakeup
the system from suspend state.

Change-Id: I9e86e7db2fee4248c35d96cf130c78b938a97aa5
Signed-off-by: Dilip Kota <dkota@codeaurora.org>