Revert "boards: Raspberry Pi pico pwm led adjustment"

This reverts commit 037a3b52a4.

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

boards/raspberrypi/rpi_pico/rpi_pico.dts

@@ -8,10 +8,6 @@
 
 #include "rpi_pico-common.dtsi"
 
-/* Only the rpi_pico/rp2040 has a pwm. */
-/* This define can be used to avoid sourcing board overlays when the PWM is not available */
-#define HAS_DT_PWM_LED 1
-
 / {
 	leds {
 		compatible = "gpio-leds";

samples/basic/blinky_pwm/boards/rpi_pico.overlay

@@ -1,7 +1,3 @@
-/* The rpi_pico/rp2040/w doesn't have a pwm. */
-/* Use the HAS_DT_PWM defined by the based board to identify when this overlay is valid */
-#if HAS_DT_PWM_LED
-
 &{/pwm_leds} {
 	status = "okay";
 };
@@ -15,5 +11,3 @@
 	divider-frac-4 = <15>;
 	divider-int-4 = <255>;
 };
-
-#endif

samples/basic/blinky_pwm/sample.yaml

@@ -8,3 +8,4 @@ tests:
       - pwm
     depends_on: pwm
     harness: led
+    platform_exclude: rpi_pico/rp2040/w