arm: dts: meson-gxl: fix USB gadget by adding missing nodes for U-Boot

The khadas-vim, khadas-vim2, libretech-ac & libretech-*-pc boards were missing
DT tweak to enable USB gadget.
Add them to their -u-boot.dtsi files and include the right gxl-u-boot.dtsi.

Fixes: a19e8a0f03 ("arm: dts: meson-gxl: Add USB Gadget nodes for U-Boot")
Reported-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/dts/meson-gxl-s805x-libretech-ac-u-boot.dtsi b/arch/arm/dts/meson-gxl-s805x-libretech-ac-u-boot.dtsi
index c35158d..474a3e1 100644
--- a/arch/arm/dts/meson-gxl-s805x-libretech-ac-u-boot.dtsi
+++ b/arch/arm/dts/meson-gxl-s805x-libretech-ac-u-boot.dtsi
@@ -4,4 +4,8 @@
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  */
 
-#include "meson-gx-u-boot.dtsi"
+#include "meson-gxl-u-boot.dtsi"
+
+&dwc2 {
+	status = "okay";
+};