ARM: dts: at91: at91sam9n12: witch sckc to new clock bindings

Switch slow clock controller to new clock bindings.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230517094119.2894220-4-claudiu.beznea@microchip.com

arch/arm/boot/dts/at91sam9n12.dtsi

@@ -146,28 +146,11 @@ shdwc@fffffe10 {
 				clocks = <&clk32k>;
 			};
 
-			sckc@fffffe50 {
+			clk32k: clock-controller@fffffe50 {
 				compatible = "atmel,at91sam9x5-sckc";
 				reg = <0xfffffe50 0x4>;
-
-				slow_osc: slow_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-osc";
-					#clock-cells = <0>;
-					clocks = <&slow_xtal>;
-				};
-
-				slow_rc_osc: slow_rc_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
-					#clock-cells = <0>;
-					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>;
 			};
 
 			mmc0: mmc@f0008000 {