ARM: dts: at91: at91sam9rl: switch to new sckc bindings

Remove the child nodes of the sckc as they are not necessary anymore.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91sam9rl.dtsi

@@ -869,30 +869,11 @@ watchdog@fffffd40 {
 				status = "disabled";
 			};
 
-			sckc@fffffd50 {
+			clk32k: sckc@fffffd50 {
 				compatible = "atmel,at91sam9x5-sckc";
 				reg = <0xfffffd50 0x4>;
-
-				slow_osc: slow_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-osc";
-					#clock-cells = <0>;
-					atmel,startup-time-usec = <1200000>;
-					clocks = <&slow_xtal>;
-				};
-
-				slow_rc_osc: slow_rc_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
-					#clock-cells = <0>;
-					atmel,startup-time-usec = <75>;
-					clock-frequency = <32768>;
-					clock-accuracy = <50000000>;
-				};
-
-				clk32k: slck {
-					compatible = "atmel,at91sam9x5-clk-slow";
-					#clock-cells = <0>;
-					clocks = <&slow_rc_osc &slow_osc>;
-				};
+				clocks = <&slow_xtal>;
+				#clock-cells = <0>;
 			};
 
 			rtc@fffffd20 {