hal: fix unused param warnings

Fix unused param warnings.
Take care of coding style issues.
Remove unwanted code to set acdb_settings.
Fix compilation issues on 8960 platform.

Change-Id: Ifc72472b487abee83ff85e21fd324cee938973e9
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 44caed4..bdb9aae 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -151,7 +151,7 @@
 
 struct stream_app_type_cfg {
     int sample_rate;
-    int bit_width;
+    uint32_t bit_width;
     int app_type;
 };