ARM: dts: imx53-kp: Drop redundant settings in pwm nodes

imx53-kp.dtsi includes imx53-tqma53.dtsi which already sets #pwm-cells
to 2. So the two nodes can be dropped without resulting in any changes
in the compiled device tree blobs.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx53-kp.dtsi

@@ -162,14 +162,6 @@ MX53_PAD_EIM_D20__GPIO3_20 0x1e4
 	>;
 };
 
-&pwm1 {
-	#pwm-cells = <2>;
-};
-
-&pwm2 {
-	#pwm-cells = <2>;
-};
-
 &uart1 {
 	status = "okay";
 };