volume_listener: Fix MBDRC volume difference issue for combo use case

-change in MBDRC level based on volume is not getting applied on combo device
 usecase (speaker is one of the device) due to speaker only check.

-Modify logic to recompute and apply MBDRC level if one of the device in combo
 device is speaker

Change-Id: I18726af9d30c966fd04666305529a46cebee18c7