dt-bindings: phy: meson-g12a-usb2-phy: convert to yaml

Now that we have the DT validation in place, let's convert the device tree
bindings for the Amlogic G12A USB2 PHY over to a YAML schemas.

While the original phy bindings specifies phy-supply as required,
the examples and implementations makes it optional, thus phy-supply
is not in the required list of attributes.

Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Martin Blumenstingl <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

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