dt-bindings: pwm: nxp,lpc32xx-pwm: Specify clocks property as mandatory

Both described in the binding PWM controllers depend on supply clocks,
thus it's necessary to specify 'clocks' property in the correspondent
device tree nodes.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251228224907.1729627-2-vz@mleia.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml

@@ -27,6 +27,7 @@ properties:
 required:
   - compatible
   - reg
+  - clocks
   - '#pwm-cells'
 
 allOf:
@@ -36,9 +37,12 @@ unevaluatedProperties: false
 
 examples:
   - |
+    #include <dt-bindings/clock/lpc32xx-clock.h>
+
     pwm@4005c000 {
         compatible = "nxp,lpc3220-pwm";
         reg = <0x4005c000 0x4>;
+        clocks = <&clk LPC32XX_CLK_PWM1>;
         #pwm-cells = <3>;
     };