ARM: dts: add missing -u-boot.dtsi to enable HDMI on Beelink GTKing/King-Pro

This lacks the right u-boot specific DT include to make HDMI work.

Reported-by: B1oHazard <ty3uk@mail.ua>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/dts/meson-g12b-gtking-u-boot.dtsi b/arch/arm/dts/meson-g12b-gtking-u-boot.dtsi
new file mode 100644
index 0000000..236f246
--- /dev/null
+++ b/arch/arm/dts/meson-g12b-gtking-u-boot.dtsi
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2019 BayLibre, SAS.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include "meson-g12-common-u-boot.dtsi"