This patch adds the necessary MDIO interface node
to the Qualcomm IPQ4019 DTSI.

Built-in QCA8337N switch is managed using it,
and since we have a driver for it lets add it.
Signed-off-by: NChristian Lamparter <chunkeey@gmail.com>
Signed-off-by: NRobert Marko <robert.marko@sartura.hr>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>