ARM: dts: at91: at91sam9g15: Style cleanup

- use tags from included dtsi instead of duplicating the hierarchy

There are no differences in the generated .dtbs
Signed-off-by: NUwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20190812212757.23432-6-uwe@kleine-koenig.orgSigned-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91sam9g15.dtsi

@@ -11,10 +11,9 @@
 / {
 	model = "Atmel AT91SAM9G15 SoC";
 	compatible = "atmel,at91sam9g15", "atmel,at91sam9x5";
+};
 
-	ahb {
-		apb {
-			pinctrl@fffff400 {
+&pinctrl {
 	atmel,mux-mask = <
 	      /*    A         B          C     */
 	       0xffffffff 0xffe0399f 0x00000000  /* pioA */
@@ -22,11 +21,8 @@
 	       0xfdffffff 0x00000000 0xb83fffff  /* pioC */
 	       0x003fffff 0x003f8000 0x00000000  /* pioD */
 	      >;
-			};
+};
 
-			pmc: pmc@fffffc00 {
+&pmc {
 	compatible = "atmel,at91sam9g15-pmc", "atmel,at91sam9x5-pmc", "syscon";
-			};
-		};
-	};
 };