powerpc/85xx: Add RTC to P1010RDB device tree

Signed-off-by: Kumar Gala <[e-mail]>

arch/powerpc/boot/dts/p1010rdb.dtsi

···
 };
 
 &board_soc {
+	i2c@3000 {
+		rtc@68 {
+			compatible = "pericom,pt7c4338";
+			reg = <0x68>;
+		};
+	};
+
 	spi@7000 {
 		flash@0 {
 			#address-cells = <1>;