ARM: dts: n900: remove unneeded unit name for dmtimer-pwm

This patch fixes the following DTC warnings for omap3-n900.dtb:

"dmtimer-pwm@9 has a unit name, but no reg property"

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index 0ceff5d..cac9a8b 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -144,7 +144,7 @@
 		io-channel-names = "temp", "bsi", "vbat";
 	};
 
-	pwm9: dmtimer-pwm@9 {
+	pwm9: dmtimer-pwm {
 		compatible = "ti,omap-dmtimer-pwm";
 		#pwm-cells = <3>;
 		ti,timers = <&timer9>;