led: led_pwm: Add a driver for LEDs connected to PWM

Add a driver which allows to use of LEDs connected
to PWM (Linux compatible).
MAINTAINERS: add i.vozvakhov as a maintainer of leds-pwm
C(required during new functionality adding).

Signed-off-by: Ivan Vozvakhov <i.vozvakhov@corp.mail.ru>
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index 430d076..418ed21 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -49,6 +49,12 @@
 	  This option enables support for LEDs connected to the Cortina
 	  Access CAxxxx SOCs.
 
+config LED_PWM
+	bool "LED PWM"
+	depends on LED && DM_PWM
+	help
+	  Enable support for LEDs connected to PWM.
+	  Linux compatible ofdata.
 
 config LED_BLINK
 	bool "Support LED blinking"