ARM: dts: am335x: Guardian: Update beeper label

 * Update lable pwm to guardian beeper
Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@in.bosch.com>
Message-Id: <20220325100613.1494-8-Gireesh.Hiremath@in.bosch.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-guardian.dts

@@ -100,11 +100,11 @@ panel-info {
 
 	};
 
-	pwm7: dmtimer-pwm {
+	guardian_beeper: dmtimer-pwm@7 {
 		compatible = "ti,omap-dmtimer-pwm";
 		ti,timers = <&timer7>;
 		pinctrl-names = "default";
-		pinctrl-0 = <&dmtimer7_pins>;
+		pinctrl-0 = <&guardian_beeper_pins>;
 		ti,clock-source = <0x01>;
 	};
 
@@ -374,9 +374,9 @@ AM33XX_IOPAD(0x9b4, PIN_OUTPUT_PULLDOWN | MUX_MODE3)
 		>;
 	};
 
-	dmtimer7_pins: pinmux_dmtimer7_pins {
+	guardian_beeper_pins: pinmux_dmtimer7_pins {
 		pinctrl-single,pins = <
-			AM33XX_IOPAD(0x968, PIN_OUTPUT | MUX_MODE5)
+			AM33XX_IOPAD(0x968, PIN_OUTPUT | MUX_MODE5) /* (E18) timer7 */
 		>;
 	};