ARM: dts: meson: add the clock inputs for the Meson timer

The Meson Timer IP block has two clock inputs:
- clk81 for using the system clock as timebase
- xtal for a timebase with 1us, 10us, 100us and 1ms resolution

The clocksource driver does not use these yet, but it's still a good
idea to add them as this describes how the hardware actually works
internally.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson6.dtsi

@@ -88,6 +88,11 @@
 	status = "disabled";
 };
 
+&timer_abcde {
+	clocks = <&xtal>, <&clk81>;
+	clock-names = "xtal", "pclk";
+};
+
 &uart_AO {
 	clocks = <&xtal>, <&clk81>, <&clk81>;
 	clock-names = "xtal", "pclk", "baud";