The Ralink USB PHY driver merged into mainline has a slightly different
device tree binding than the patch that was used with linux 4.9.
The new driver requires a `ralink,sysctl` node pointing to the `syscon`
node.
This patch also sets `#phy-cells` to 0, as recommended by the mainline
documentation [1].
[1] Documentation/devicetree/bindings/phy/ralink-usb-phy.txt
Signed-off-by: Vianney le Clément de Saint-Marcq <code@quartic.eu>
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