ARM: tegra: Rename GPU node on Tegra124

In order to be able to pass DT schema validation, change the GPU nodes'
unit-address to the standard notation. Previously this was using a "0,"
prefix that originated from a time when the top-level device tree node
contained #address-cells = <2>.

Note that this technically breaks backwards-compatibility with certain
older versions of the U-Boot bootloader because early versions used a
hard-coded DT path lookup to find the GPU node and perform some fixups
on it. However, this was changed to a compatible string based lookup in
April 2016, so it's reasonable to expect people to update U-Boot on the
systems that they want to use this updated kernel DTB with.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra124-apalis-v1.2.dtsi

@@ -57,7 +57,7 @@ hdmi@54280000 {
 		};
 	};
 
-	gpu@0,57000000 {
+	gpu@57000000 {
 		/*
 		 * Node left disabled on purpose - the bootloader will enable
 		 * it after having set the VPR up

arch/arm/boot/dts/tegra124-apalis.dtsi

@@ -56,7 +56,7 @@ hdmi@54280000 {
 		};
 	};
 
-	gpu@0,57000000 {
+	gpu@57000000 {
 		/*
 		 * Node left disabled on purpose - the bootloader will enable
 		 * it after having set the VPR up

arch/arm/boot/dts/tegra124-jetson-tk1.dts

@@ -72,7 +72,7 @@ cec@70015000 {
 		status = "okay";
 	};
 
-	gpu@0,57000000 {
+	gpu@57000000 {
 		/*
 		 * Node left disabled on purpose - the bootloader will enable
 		 * it after having set the VPR up

arch/arm/boot/dts/tegra124-nyan.dtsi

@@ -61,7 +61,7 @@ dpaux@545c0000 {
 		};
 	};
 
-	gpu@0,57000000 {
+	gpu@57000000 {
 		status = "okay";
 
 		vdd-supply = <&vdd_gpu>;

arch/arm/boot/dts/tegra124-venice2.dts

@@ -51,7 +51,7 @@ dpaux@545c0000 {
 		};
 	};
 
-	gpu@0,57000000 {
+	gpu@57000000 {
 		/*
 		 * Node left disabled on purpose - the bootloader will enable
 		 * it after having set the VPR up

arch/arm/boot/dts/tegra124.dtsi

@@ -223,12 +223,7 @@ gic: interrupt-controller@50041000 {
 		interrupt-parent = <&gic>;
 	};
 
-	/*
-	 * Please keep the following 0, notation in place as a former mainline
-	 * U-Boot version was looking for that particular notation in order to
-	 * perform required fix-ups on that GPU node.
-	 */
-	gpu@0,57000000 {
+	gpu@57000000 {
 		compatible = "nvidia,gk20a";
 		reg = <0x0 0x57000000 0x0 0x01000000>,
 		      <0x0 0x58000000 0x0 0x01000000>;