Make the SOF control, PCM and PM code IPC agnostic

Merge series from Ranjani Sridharan <ranjani.sridharan@linux.intel.com>:

This series is a continuation to the SOF IPC abstraction work to support
the new IPC version introduced in the SOF firmware. It makes the top-level
control IO, PCM and PM code IPC-agnostic. Other than the first patch,
the rest are purely for abstraction and include no changes in
functionality.

Author: broonie

sound/soc/sof/Makefile

@@ -2,7 +2,7 @@
 
 snd-sof-objs := core.o ops.o loader.o ipc.o pcm.o pm.o debug.o topology.o\
 		control.o trace.o iomem-utils.o sof-audio.o stream-ipc.o\
-		ipc3-topology.o
+		ipc3-topology.o ipc3.o ipc3-control.o ipc3-pcm.o
 ifneq ($(CONFIG_SND_SOC_SOF_CLIENT),)
 snd-sof-objs += sof-client.o
 endif