audio: hal: changes to support compressed input for transcode loopback

- Support compressed input format in transcode loopback extension
- Support compressed input format in target platform
- Test application changes to support pcm and compressed input formats

CRs-Fixed: 2061945
Change-Id: I693594164e05c09ffece8fa705149c7b45c2e5d3
Signed-off-by: Siddartha Shaik <sshaik@codeaurora.org>