Share AudioPort/Config conversion with HAL types

At the framework level, AudioPort and AudioPortConfig are
split into HAL and System parts. Move the conversion of
the HAL part to AidlConversionCppNdk for use by libaudiohal.
Reuse code from AidlConversionCppNdk in AidlConversion
where possible.

Added tests for round-trip conversion.

Bug: 205884982
Test: atest audio_aidl_conversion_tests
Change-Id: I8adac946e30bfbe1d3ec5461e740c259b880b59a