ARM: tegra: set up /aliases entries for RTCs

This ensures that the PMIC RTC provides the system time, rather than
the on-SoC RTC, which is not battery-backed.

tegra124-venice2.dts isn't touched yet since we haven't added any off-
SoC RTC device to its device tree.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
index f3aab9e..dfcc18a 100644
--- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
+++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
@@ -27,6 +27,11 @@
 	model = "NVIDIA Tegra30 Cardhu evaluation board";
 	compatible = "nvidia,cardhu", "nvidia,tegra30";
 
+	aliases {
+		rtc0 = "/i2c@7000d000/tps6586x@34";
+		rtc1 = "/rtc@7000e000";
+	};
+
 	memory {
 		reg = <0x80000000 0x40000000>;
 	};