dt-bindings: usb: add rk3576 compatible to rockchip,dwc3

Add the compatible for the Rockchip RK3576 variant.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241016083224.14839-1-frawang.cn@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>