samples: led: consolidate LED samples under same directory

With over a dozen LED samples, grouping them in a common drivers/led/
folder helps keep things tidy and lays the groundwork for further
improvements in the way samples are showing up in the docs.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

MAINTAINERS.yml

@@ -1739,7 +1739,7 @@ Release Notes:
     - drivers/led/
     - include/zephyr/drivers/led/
     - include/zephyr/drivers/led.h
-    - samples/drivers/led_*/
+    - samples/drivers/led/
     - tests/drivers/led/
     - doc/hardware/peripherals/led.rst
     - tests/drivers/build_all/led/

boards/bcdevices/plt_demo_v2/doc/index.rst

@@ -221,8 +221,20 @@
     ('samples/drivers/adc/README', 'samples/drivers/adc/adc_dt/README'),
     ('samples/drivers/kscan_touch', 'samples/subsys/input/input'),
     ('samples/drivers/led_apa102/README', 'samples/drivers/led_strip/README'),
+    ('samples/drivers/led_is31fl3194/README', 'samples/drivers/led/is31fl3194/README'),
+    ('samples/drivers/led_is31fl3216a/README', 'samples/drivers/led/is31fl3216a/README'),
+    ('samples/drivers/led_is31fl3733/README', 'samples/drivers/led/is31fl3733/README'),
+    ('samples/drivers/led_lp3943/README', 'samples/drivers/led/lp3943/README'),
+    ('samples/drivers/led_lp50xx/README', 'samples/drivers/led/lp50xx/README'),
+    ('samples/drivers/led_lp5562/README', 'samples/drivers/led/lp5562/README'),
+    ('samples/drivers/led_lp5569/README', 'samples/drivers/led/lp5569/README'),
     ('samples/drivers/led_lpd8806/README', 'samples/drivers/led_strip/README'),
+    ('samples/drivers/led_pca9633/README', 'samples/drivers/led/pca9633/README'),
+    ('samples/drivers/led_pwm/README', 'samples/drivers/led/pwm/README'),
+    ('samples/drivers/led_strip/README', 'samples/drivers/led/led_strip/README'),
+    ('samples/drivers/led_sx1509b_intensity/README', 'samples/drivers/led/sx1509b_intensity/README'),
     ('samples/drivers/led_ws2812/README', 'samples/drivers/led_strip/README'),
+    ('samples/drivers/led_xec/README', 'samples/drivers/led/xec/README'),
     ('samples/net/cloud/google_iot_mqtt/README', 'samples/net/net'),
     ('samples/sensor/wsen_hids/README', 'samples/sensor/sensor'),
     ('samples/sensor/wsen_itds/README', 'samples/sensor/sensor'),