arm64: allwinner: h6: Enable GPU node for Tanix TX6

Unlike other H6 boards, Tanix TX6 doesn't have a PMIC so we can enable
the GPU without providing a specific power supply.
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm64/boot/dts/allwinner/sun50i-h6-tanix-tx6.dts

@@ -53,6 +53,10 @@ &ehci3 {
 	status = "okay";
 };
 
+&gpu {
+	status = "okay";
+};
+
 &hdmi {
 	status = "okay";
 };