audio_hal_interface: Rename aidl/provider_info.cc to aidl/a2dp_provider_info.cc

The provider info cache is a2dp specific and should not
be used for HFP or LE audio

Bug: 308686081
Test: m com.android.btservice
Change-Id: Ib6a79f596c0f196a6c030b7f23450863c1f1c8f5