arm64: dts: rockchip: Fix USB interface compatible string on kobol-helios64

The correct compatible string for a USB interface node begins with
"usbif", not "usb". Fix the Rockchip RK3399 based Kobol Helios64 board.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240412204405.3703638-1-robh@kernel.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>