ARM: dts: uniphier: Rename usb-phy node for USB2 to usb-controller

Actual phy nodes are each child node. The parent node should be
usb-controller node as a representation of the phy integration.
This applies to the devicetree for Pro4 SoC.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042249.4708-3-hayashi.kunihiko@socionext.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>