arm64: tegra: Add clock for Tegra234 RTC

The RTC device requires a clock. Add it.
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra234.dtsi

@@ -93,6 +93,8 @@ rtc@c2a0000 {
 			reg = <0x0c2a0000 0x10000>;
 			interrupt-parent = <&pmc>;
 			interrupts = <73 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&bpmp TEGRA234_CLK_CLK_32K>;
+			clock-names = "rtc";
 			status = "disabled";
 		};