arm64: dts: mediatek: asurada: Enable XHCI

Enable XHCI controller on the Asurada platform. This allows the use of
the USB ports, and therefore a rootfs can be loaded and a usable shell
reached from a live USB image.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20220629155956.1138955-14-nfraprado@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>