dt: bindings: add bindings for Allwinner A64 usb phy
Update sun4i usb phy dt binding documentation to include support for
Allwinner A64 usb phy.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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