hal: platform: Invoke acdb deallocate api

Invoke acdb deallocate api during audiohal
unload process.

Change-Id: Id7d8f456597f8a9b28e54ef20d70b1747f394605
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 8b4ba5e..a48d5b0 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -2563,6 +2563,9 @@
         my_data->adev->mixer = NULL;
     }
 
+    if (my_data->acdb_deallocate)
+        my_data->acdb_deallocate();
+
     free(platform);
     /* deinit usb */
     audio_extn_usb_deinit();