smdk4412-common: camera: release face detection memory when capture stops

Change-Id: I6724ce6dde3c4b6242a06b73808905a6de094d4a
smdk4412-common: audio: remove old workaround for call audio issues

Recent commits to audio routing have fixed the first call microphone
issues and this hacky workaround is no longer required.

Change-Id: I90ae0f20b4f7f734135fb3fae41eae0fe3289aa5