arm64: dts: rockchip: fix comment for upper usb3 port

The comment for the host2_xhci points to the wrong port on the board.
The upper usb3 port is the correct one, so fix the comment to prevent
confusion.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240422163951.2604273-2-heiko@sntech.de


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

[ upstream commit: 3482efee1144262dc839792103e6a9e29defecbc ]

(cherry picked from commit 56f3031edf22d163f10bc4b631d37a9aaa82d4d4)