ARM: dts: n900: cleanup

Fix GPIO comment to be consistent with rest of file and add comment what
tpa6130 is.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Reviewed-By: Sebastian Reichel <sre@kernel.org>
Reviewed-By: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap3-n900.dts

@@ -47,7 +47,7 @@
 		compatible = "gpio-leds";
 		heartbeat {
 			label = "debug::sleep";
-			gpios = <&gpio6 2 GPIO_ACTIVE_HIGH>;  /* gpio162 */
+			gpios = <&gpio6 2 GPIO_ACTIVE_HIGH>;  /* 162 */
 			linux,default-trigger = "default-on";
 			pinctrl-names = "default";
 			pinctrl-0 = <&debug_leds>;
@@ -625,6 +625,7 @@
 		reg = <0x55>;
 	};
 
+	/* Stereo headphone amplifier */
 	tpa6130a2: tpa6130a2@60 {
 		compatible = "ti,tpa6130a2";
 		reg = <0x60>;