UPSTREAM: ASoC: tas5720: add basic support for TAS5722 devices

The TI TAS5722 digital amplifier is very similar to the TAS5720 from an
overall and register map perspective. Therefore the existing driver can be
extended easily to support this additional device. This commit allows
TAS5722 devices to be used in a "subset" type of fashion, without exposing
any of the additional features they offer.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 872bcad2)

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

Change-Id: I90dbce9f71d252f714012f74018fe5ca337c0456
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1413438


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