audio hal default impl: Check for "default" instance name

With MSD it's possible to have another instance of IDeviceFactory.
For passthrough implementations it's necessary to check whether
the instance name is "default" because otherwise HIDL framework
will attempt to use the default implementation for MSD.

Do the same for effects in case some special effects will be
needed for MSD.

Bug: 38184704
Bug: 63901775
Change-Id: I18044f3a97e3f6ec4dc3f35b3a9300ea404fc07e
Test: audio works, effects work