arm64: tegra: p2180: Explicitly enable GPU

The gpu node originally was explicitly left disabled as it was expected
for the bootloader to enable it. However, this is only done in u-boot.
If u-boot is not in the boot chain, this will never be enabled. Other
Tegra210 devices already explicitly enable the gpu, so make p2180 match.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi

@@ -24,6 +24,7 @@
 
 	gpu@57000000 {
 		vdd-supply = <&vdd_gpu>;
+		status = "okay";
 	};
 
 	/* debug port */