mach-imx7d.c: use enet_out clk to decide on PHY clock

The i.MX 7 can provide a reference clock to the PHY or use a reference clock
from an external circuit.

If the device-tree node with compatible "fsl,imx7d-fec" has a clock named
enet_out then provide the clock from the i.MX 7, if such a clock is missing
use a clock provided from an external circuit.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>

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