sdm: Add debug TAG for Qdcm debugging

Add support to be able to solely debug QDCM tool path.

Change-Id: I2160a02e95774f284c65062d97c1ae400afcba2d
diff --git a/libqservice/IQService.h b/libqservice/IQService.h
index 00bf90e..16ea704 100644
--- a/libqservice/IQService.h
+++ b/libqservice/IQService.h
@@ -86,6 +86,7 @@
         DEBUG_PIPE_LIFECYCLE,
         DEBUG_DRIVER_CONFIG,
         DEBUG_ROTATOR,
+        DEBUG_QDCM,
     };
 
     enum {