audio: Drop LOCAL_COPY_HEADERS usage

LOCAL_COPY_HEADERS is deprecated, so remove all its usages
to avoid build warnings.

Change-Id: I4c52508e9109c5f448653fd5613a8991d28bbb2e
(cherry picked from commit 9abdcc75b4d8379e4b2d30a1068526e9dcae9425)
4 files changed