arm64: dts: uniphier: fix widget name of headphone for LD11/LD20 boards

This patch fixes wrong name of headphone widget for receiving events
of insert/remove headphone plug from simple-card or audio-graph-card.

If we use wrong widget name then we get warning messages such as
"asoc-audio-graph-card sound: ASoC: DAPM unknown pin Headphones"
when the plug is inserted or removed from headphone jack.

Fixes: fb21a0ac ("arm64: dts: uniphier: add sound node")
Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm64/boot/dts/socionext/uniphier-ld11-global.dts

@@ -54,7 +54,7 @@ amp_vcc_reg: reg-fixed {
 	sound {
 		compatible = "audio-graph-card";
 		label = "UniPhier LD11";
-		widgets = "Headphone", "Headphone Jack";
+		widgets = "Headphone", "Headphones";
 		dais = <&i2s_port2
 			&i2s_port3
 			&i2s_port4

arch/arm64/boot/dts/socionext/uniphier-ld20-global.dts

@@ -54,7 +54,7 @@ amp_vcc_reg: reg-fixed {
 	sound {
 		compatible = "audio-graph-card";
 		label = "UniPhier LD20";
-		widgets = "Headphone", "Headphone Jack";
+		widgets = "Headphone", "Headphones";
 		dais = <&i2s_port2
 			&i2s_port3
 			&i2s_port4