hal: Fixes for initalizing audio_extn features

1) Fixes for initializing audio_extn features such as speaker_prot,
fm,etc.
2) Runtime detection using vndk_fwkdetect lib has been
changed to dynamic loading instead of static linking

Change-Id: I4deef5e9ffefc17e427ecf5a271ed7bcd18dbb0f
11 files changed