doc: dt: bindings: usb: dwc3: remove amlogic compatible entries

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Documentation/devicetree/bindings/usb/dwc3.txt

@@ -15,8 +15,6 @@ Required properties:
 Exception for clocks:
   clocks are optional if the parent node (i.e. glue-layer) is compatible to
   one of the following:
-    "amlogic,meson-axg-dwc3"
-    "amlogic,meson-gxl-dwc3"
     "cavium,octeon-7130-usb-uctl"
     "qcom,dwc3"
     "samsung,exynos5250-dwusb3"