ARM: dts: bcm958625-meraki-mx6x: Use #pwm-cells = <3>

bcm-nsp.dtsi has #pwm-cells = <3> as is specified in the binding. So to
also use that correct value for bcm958625-meraki-mx6x the property
overriding that value just has to be dropped. This fixes a few warnings
like:

arch/arm/boot/dts/broadcom/bcm958625-meraki-mx65.dtb: pwm@31000: #pwm-cells: 3 was expected
from schema $id: http://devicetree.org/schemas/pwm/brcm,iproc-pwm.yaml#

Signed-off-by: Uwe Kleine-König <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/broadcom/bcm958625-meraki-mx6x-common.dtsi

···
 		led-1 {
 			function = LED_FUNCTION_INDICATOR;
 			color = <LED_COLOR_ID_RED>;
-			pwms = <&pwm 1 50000>;
+			pwms = <&pwm 1 50000 0>;
 			max-brightness = <255>;
 		};
 
 		led-2 {
 			function = LED_FUNCTION_POWER;
 			color = <LED_COLOR_ID_GREEN>;
-			pwms = <&pwm 2 50000>;
+			pwms = <&pwm 2 50000 0>;
 			max-brightness = <255>;
 		};
 
 		led-3 {
 			function = LED_FUNCTION_INDICATOR;
 			color = <LED_COLOR_ID_BLUE>;
-			pwms = <&pwm 3 50000>;
+			pwms = <&pwm 3 50000 0>;
 			max-brightness = <255>;
 		};
 	};
···
 
 &pwm {
 	status = "okay";
-	#pwm-cells = <2>;
 };
 
 &uart0 {