powerpc: Add I2C bus multiplexer node for B4 and T4240QDS

In both B4 and T4240QDS platform PCA9547 I2C bus multiplexer is used.
The sub-nodes are also reorganized according to right I2C topology.
Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

arch/powerpc/boot/dts/b4qds.dtsi

@@ -120,6 +120,17 @@ sdhc@114000 {
 		};
 
 		i2c@118000 {
+			mux@77 {
+				compatible = "nxp,pca9547";
+				reg = <0x77>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+
 					eeprom@50 {
 						compatible = "at24,24c64";
 						reg = <0x50>;
@@ -141,6 +152,8 @@ rtc@68 {
 						reg = <0x68>;
 					};
 				};
+			};
+		};
 
 		usb@210000 {
 			dr_mode = "host";

arch/powerpc/boot/dts/t4240qds.dts

@@ -118,6 +118,17 @@ flash@0 {
 		};
 
 		i2c@118000 {
+			mux@77 {
+				compatible = "nxp,pca9547";
+				reg = <0x77>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+
 					eeprom@51 {
 						compatible = "at24,24c256";
 						reg = <0x51>;
@@ -148,6 +159,8 @@ rtc@68 {
 						interrupts = <0x1 0x1 0 0>;
 					};
 				};
+			};
+		};
 
 		sdhc@114000 {
 			voltage-ranges = <1800 1800 3300 3300>;