An I2S port can be connected to multiple BE pipes, get module config
only for the active BE pipe.

This helpers helps to do that and is used in subsequent patches
Signed-off-by: Dharageswari R <dharageswari.r@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>