meson: axg: search dtb for meson-axg-usb-ctrl on board axg

USB controller for AXG is described as meson-axg-usb-ctrl,
see arch/arm/dts/meson-axg.dtsi
Look for that name instead of meson-gxl-usb-ctrl.

Signed-off-by: Sergei Antonov <saproj@gmail.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220509113618.2891126-1-saproj@gmail.com