1. SOF doesn't have to be built in .bin format
2. don't include soc.c and soc_mp.c twice in cmake
3. remove an unused mailbox.h header
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Adds the Sound Open Firmware project, built as a Zephyr application,
under samples/subsys/sudio/sof.
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>