Disable busfreq.

Fixing performance issues for b/122963891

Change-Id: I18f91317f23f7b8d83425983d03e432186cd4898
diff --git a/arch/arm64/boot/dts/freescale/fsl-imx8mq-phanbell.dts b/arch/arm64/boot/dts/freescale/fsl-imx8mq-phanbell.dts
index b6143b0..8df4540 100644
--- a/arch/arm64/boot/dts/freescale/fsl-imx8mq-phanbell.dts
+++ b/arch/arm64/boot/dts/freescale/fsl-imx8mq-phanbell.dts
@@ -52,6 +52,10 @@
 		google,model = "edgetpu-audio-card";
         status = "okay";
 	};
+
+	busfreq {
+		status = "disabled";
+	};
 };
 
 &iomuxc {