arm64: dts: renesas: rzg2l-smarc: Add Mic routing

Add audio routing for Mic with bias to reduce noise when doing
audio capture.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20210921084605.16250-5-biju.das.jz@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg2l-smarc.dtsi

@@ -47,6 +47,12 @@ snd_rzg2l: sound {
 		simple-audio-card,frame-master = <&cpu_dai>;
 		simple-audio-card,mclk-fs = <256>;
 
+		simple-audio-card,widgets = "Microphone", "Microphone Jack";
+		simple-audio-card,routing =
+			    "L2", "Mic Bias",
+			    "R2", "Mic Bias",
+			    "Mic Bias", "Microphone Jack";
+
 		cpu_dai: simple-audio-card,cpu {
 			sound-dai = <&ssi0>;
 		};