sandbox: dts: Add the real-time-clock test nodes back in

These were lost when the PMIC series was applied. Add them back so that the
tests pass again.

Reported-by: Joe Hershberger <joe.hershberger@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

arch/sandbox/dts/test.dts

@@ -12,6 +12,8 @@
 		eth5 = &eth_5;
 		i2c0 = "/i2c@0";
 		pci0 = &pci;
+		rtc0 = &rtc_0;
+		rtc1 = &rtc_1;
 		spi0 = "/spi@0";
 		testfdt6 = "/e-test";
 		testbus3 = "/some-bus";
@@ -153,6 +155,22 @@
 			};
 		};
 
+		rtc_0: rtc@43 {
+			reg = <0x43>;
+			compatible = "sandbox-rtc";
+			emul {
+				compatible = "sandbox,i2c-rtc";
+			};
+		};
+
+		rtc_1: rtc@61 {
+			reg = <0x61>;
+			compatible = "sandbox-rtc";
+			emul {
+				compatible = "sandbox,i2c-rtc";
+			};
+		};
+
 		sandbox_pmic: sandbox_pmic {
 			reg = <0x40>;
 		};