hal: force stop after drain.

Force playback state to IDLE and send compress_stop()
when drain completes to force reset driver and DSP pointers.
This ensures that even if last write was partial, next write
will be on a 32 byte boundary.

Also do not wait for write completion if compress_write()
returns an error.

Bug 8174410.

Change-Id: If144981c6396b24515d45b32a75ab61872a35ea2