FROMLIST: ASoC: SOF: Add support for IPC IO between DSP and Host

Define an IPC ABI for all host <--> DSP communication. This ABI should
be transport agnostic. i.e. it should work on MMIO and SPI/I2C style
interfaces.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
(cherry picked from commit 93bdd9343459d3543056c743d3ae25cef3ac3be7)
Link:https://github.com/thesofproject/linux/commit/93bdd9343459d3543056c743d3ae25cef3ac3be7


Signed-off-by: Samaga Prasanna Krishna <samaga.krishna@intel.corp-partner.google.com>

BUG=b:110025789
TEST=Test Audio use cases after full SOF series patches are applied.

Change-Id: I328cec6f410be380806ba5af8243bc90638c610e
Reviewed-on: https://chromium-review.googlesource.com/1120588


Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>