ARM: dts: Extend exynos5250-pinctrl nodes using labels instead of paths

A previously defined Device Tree node, can be extended either by defining
a node using the same full path or by creating a label for the node and
referencing to it.

Using full paths is more error prone since if there was a typo error, a
new node will be created instead of extending the node as it was desired.
This will lead to run-time errors that could be hard to detect.

A mistyped label on the other hand, will cause a dtc compile error which
makes it easier to detect the mistake since happens at build-time instead.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NKukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos5250-pinctrl.dtsi

@@ -12,8 +12,7 @@
  * published by the Free Software Foundation.
 */
 
-/ {
-	pinctrl@11400000 {
+&pinctrl_0 {
 	gpa0: gpa0 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -588,9 +587,9 @@
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
+};
 
-	pinctrl@13400000 {
+&pinctrl_1 {
 	gpe0: gpe0 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -734,9 +733,9 @@
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
+};
 
-	pinctrl@10d10000 {
+&pinctrl_2 {
 	gpv0: gpv0 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -796,9 +795,9 @@
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
+};
 
-	pinctrl@03860000 {
+&pinctrl_3 {
 	gpz: gpz {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -814,5 +813,4 @@
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
 };