libqservice: Correct enum declarations w.r.t. dyn_pu node value

Currently, value in dyn_pu reflects partial update feature enabled
for 1 and display post-processing features enabled for 0. But in
HAL, these declarations are in other way round. For consistency,
correcting these declarations.

Change-Id: Ic4abe6a8b1cdf1ca980494ed2fbe9eb7b5df6553
diff --git a/libqservice/IQService.h b/libqservice/IQService.h
index 5054578..1f28cee 100644
--- a/libqservice/IQService.h
+++ b/libqservice/IQService.h
@@ -88,8 +88,8 @@
     };
 
     enum {
-        PREF_PARTIAL_UPDATE,
         PREF_POST_PROCESSING,
+        PREF_PARTIAL_UPDATE,
         ENABLE_PARTIAL_UPDATE,
     };