Move encapsulation info fields to stable types

Move the following fields from framework types to stable:
 - {AudioPortDeviceExtSys->AudioPortDeviceExt}.encapsulationModes
 - {AudioPortDeviceExtSys->AudioPortDeviceExt}.encapsulationMetadataTypes

This information is reported by the HAL and is used by
the framework.

Bug: 270731693
Test: atest audio_aidl_conversion_tests
Change-Id: I908761c34870f290366b1d0d343cb665511d8b9b