ARM: dts: STiHxxx-b2120: change sound card name

Rename sound card to differentiate B2120 and B2260 sound card.
Sound card name is used by alsa-lib to load associated card
configuration file.
Signed-off-by: NArnaud Pouliquen <arnaud.pouliquen@st.com>

arch/arm/boot/dts/stihxxx-b2120.dtsi

@@ -155,7 +155,7 @@
 
 		sound {
 			compatible = "simple-audio-card";
-			simple-audio-card,name = "sti audio card";
+			simple-audio-card,name = "STI-B2120";
 			status = "okay";
 
 			simple-audio-card,dai-link@0 {