MAINTAINERS: pwm: add entry for Microchip pwm driver

Add the entry that was missing for pwm-atmel.c driver. Add binding file
as well.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

MAINTAINERS

@@ -9553,6 +9553,14 @@ L:	netdev@vger.kernel.org
 S:	Maintained
 F:	drivers/net/ethernet/microchip/lan743x_*
 
+MICROCHIP PWM DRIVER
+M:	Claudiu Beznea <claudiu.beznea@microchip.com>
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+L:	linux-pwm@vger.kernel.org
+S:	Supported
+F:	drivers/pwm/pwm-atmel.c
+F:	Documentation/devicetree/bindings/pwm/atmel-pwm.txt
+
 MICROCHIP USB251XB DRIVER
 M:	Richard Leitner <richard.leitner@skidata.com>
 L:	linux-usb@vger.kernel.org