ARM: davinci: da850: add RTC DT entries

Add RTC DT entries in da850 dts file.

Tested on da850-evm device.
Test Procedure:
$ date 2013.01.28-10:00:00 # usage: date[YYYY.]MM.DD-hh:mm[:ss]
$ hwclock -w
(reset board and check system time)

Signed-off-by: Mrugesh Katepallewar <mrugesh.mk@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/boot/dts/da850-evm.dts

@@ -27,6 +27,9 @@
 		serial2: serial@1d0d000 {
 			status = "okay";
 		};
+		rtc0: rtc@1c23000 {
+			status = "okay";
+		};
 	};
 	nand_cs3@62000000 {
 		status = "okay";

arch/arm/boot/dts/da850.dtsi

@@ -81,6 +81,13 @@
 			interrupts = <61>;
 			status = "disabled";
 		};
+		rtc0: rtc@1c23000 {
+			compatible = "ti,da830-rtc";
+			reg = <0x23000 0x1000>;
+			interrupts = <19
+				      19>;
+			status = "disabled";
+		};
 	};
 	nand_cs3@62000000 {
 		compatible = "ti,davinci-nand";