arm64: dts: juno: Move fixed devices out of bus node

The devicetree compiler complains when DT nodes without a reg property
live inside a (simple) bus node:
Warning (simple_bus_reg): Node /bus@8000000/v2m_refclk32khz
                          missing or empty reg/ranges property

Move the fixed clocks, the fixed regulator, and the gpio keys to the
root node, since they do not depend on any busses.

Link: https://lore.kernel.org/r/20200513103016.130417-7-andre.przywara@arm.comSigned-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

arch/arm64/boot/dts/arm/juno-motherboard.dtsi

@@ -8,7 +8,6 @@
  */
 
 / {
-	bus@8000000 {
 	mb_clk24mhz: clk24mhz {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
@@ -37,17 +36,6 @@ v2m_refclk32khz: refclk32khz {
 		clock-output-names = "juno_mb:refclk32khz";
 	};
 
-		motherboard {
-			compatible = "arm,vexpress,v2p-p1", "simple-bus";
-			#address-cells = <2>;  /* SMB chipselect number and offset */
-			#size-cells = <1>;
-			#interrupt-cells = <1>;
-			ranges;
-			model = "V2M-Juno";
-			arm,hbi = <0x252>;
-			arm,vexpress,site = <0>;
-			arm,v2m-memory-map = "rs1";
-
 	mb_fixed_3v3: mcc-sb-3v3 {
 		compatible = "regulator-fixed";
 		regulator-name = "MCC_SB_3V3";
@@ -103,6 +91,18 @@ nmi-button {
 		};
 	};
 
+	bus@8000000 {
+		motherboard {
+			compatible = "arm,vexpress,v2p-p1", "simple-bus";
+			#address-cells = <2>;  /* SMB chipselect number and offset */
+			#size-cells = <1>;
+			#interrupt-cells = <1>;
+			ranges;
+			model = "V2M-Juno";
+			arm,hbi = <0x252>;
+			arm,vexpress,site = <0>;
+			arm,v2m-memory-map = "rs1";
+
 			flash@0 {
 				/* 2 * 32MiB NOR Flash memory mounted on CS0 */
 				compatible = "arm,vexpress-flash", "cfi-flash";