arm: dts: sync rtc node of am335x boards with Linux 5.9-rc7

There have been some changes to the am335x-<board> DTs related to the
rtc node, so let's re-syncs them with Linux.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20210602203805.11494-7-dariobin@libero.it
diff --git a/arch/arm/dts/am335x-osd335x-common.dtsi b/arch/arm/dts/am335x-osd335x-common.dtsi
index f8ff473..2b55b7d 100644
--- a/arch/arm/dts/am335x-osd335x-common.dtsi
+++ b/arch/arm/dts/am335x-osd335x-common.dtsi
@@ -122,3 +122,9 @@
 &sham {
 	status = "okay";
 };
+
+&rtc {
+	clocks = <&clk_32768_ck>, <&clk_24mhz_clkctrl AM3_CLK_24MHZ_CLKDIV32K_CLKCTRL 0>;
+	clock-names = "ext-clk", "int-clk";
+	system-power-controller;
+};