rpi: temporarily disable SOF DT

The SOF DT doesn't compile yet, it's only provided as an example,
disable it for now to prevent automated builds from failing.

Signed-off-by: Guennadi Liakhovetski <[email protected]>

Author: lyakh

arch/arm/boot/dts/bcm2836-rpi-2-b.dts

@@ -4,7 +4,7 @@
 #include "bcm2835-rpi.dtsi"
 #include "bcm283x-rpi-smsc9514.dtsi"
 #include "bcm283x-rpi-usb-host.dtsi"
-#include "bcm283x-rpi-sof.dtsi"
+//#include "bcm283x-rpi-sof.dtsi"
 
 / {
 	compatible = "raspberrypi,2-model-b", "brcm,bcm2836";