ARM: dts: am335x-pcm-953: Remove superseded/invalid LED trigger.

According to docu and dtschema check, 'linux,default-trigger = gpio' is
no longer valid, so remove it.
Signed-off-by: Steffen Hemer <s.hemer@phytec.de>
Message-Id: <20230214132302.39087-7-s.hemer@phytec.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-pcm-953.dtsi

@@ -36,13 +36,11 @@ user_leds: user-leds {
 
 		user-led0 {
 			gpios = <&gpio1 30 GPIO_ACTIVE_HIGH>;
-			linux,default-trigger = "gpio";
 			default-state = "on";
 		};
 
 		user-led1 {
 			gpios = <&gpio1 31 GPIO_ACTIVE_LOW>;
-			linux,default-trigger = "gpio";
 			default-state = "on";
 		};
 	};