hal: Fix memory leak in audiohal

Memory allocated for platform_set_acdb_metainfo_key() and my_data in
platform specific file, but this memory was not freed. Due to this
memory leak was happening. So, freed memory in platform_deinit() to
avoid memory leak.

Change-Id: Ia93d235a010d56730e0bad2125be7ef80e7d5ca0
3 files changed