The stm32-i2s binding inherits from the standard audio-graph-port
schema for its 'port' subnode, audio-graph-port requires the use
of the 'dai-format' property. The stm32mp151c-plyaqm dts file was
using the non-standard name 'format'.

Correct the property name to 'dai-format' to fix the dtbs_check
validation error.

Fixes: 9365fa46be358 ("ARM: dts: stm32: Add Plymovent AQM devicetree")
Signed-off-by: Jihed Chaibi <redacted>
---
  arch/arm/boot/dts/st/stm32mp151c-plyaqm.dts | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/st/stm32mp151c-plyaqm.dts b/arch/arm/boot/dts/st/stm32mp151c-plyaqm.dts
index 39a3211c613..55fe916740d 100644
--- a/arch/arm/boot/dts/st/stm32mp151c-plyaqm.dts
+++ b/arch/arm/boot/dts/st/stm32mp151c-plyaqm.dts

@@ -239,7 +239,7 @@ &i2s1 {
  
  	i2s1_port: port {
  		i2s1_endpoint: endpoint {
-			format = "i2s";
+			dai-format = "i2s";
  			mclk-fs = <256>;
  			remote-endpoint = <&codec_endpoint>;
  		};