soundwire: intel/cadence: expose PING status in manager ops

Simple indirection to existing register.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20220714011043.46059-3-yung-chuan.liao@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>