All nodes and handles related to USB have the prefix usb or usb2,
whereas the phy handles are prefixed with u2phy. Rename for
consistency reasons and to facilitate sorting.

This patch also updates the handles in the only board file that
uses them (rk3566-quartz64-a.dts).
Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20220127190456.2195527-1-michael.riesch@wolfvision.netSigned-off-by: Heiko Stuebner <heiko@sntech.de>