UPSTREAM: ASoC: spdif: Add S32_LE support for S/PDIF dummy codec drivers

AIO on UniPhier can output S/PDIF where no codec is needed.
This patch adds S32_LE support for dummy codec drivers.

If one S/PDIF controller has its own limitation, its CPU DAI driver should
set the supported format by its own circumstance, since the soc-pcm driver
will use the intersection of cpu_dai's formats and codec_dai's formats.

Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit eb733366)

BUG=b:110025789
TEST=Test Audio use cases with full SOF 0.6 rebase release series applied.

Change-Id: I6da67ee81ad06cd817ea4e4172a92cc5e1d01589
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1410710


Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Kamal Ap <kamal.ap@intel.com>