UPSTREAM: ASoC: max9867: Fix codec capabilities

Codes is stereo only with playback and capture streams bind
to the same rate.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit e6ceb922)
Signed-off-by: Samaga Prasanna Krishna <samaga.krishna@intel.corp-partner.google.com>

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

Change-Id: If64700f1a1a67e7a96eef83e9747e101848bba62
Reviewed-on: https://chromium-review.googlesource.com/1353435


Commit-Ready: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>