sdm: Change log level to warning

Change log level to warning because this log doesn't mean serious error.
This change masks error message printing in stability test.

Change-Id: I764123a122a12a890f455ca5ebe918693319e3d6
diff --git a/sdm/libs/core/display_builtin.cpp b/sdm/libs/core/display_builtin.cpp
index b567a80..3a5a8a1 100644
--- a/sdm/libs/core/display_builtin.cpp
+++ b/sdm/libs/core/display_builtin.cpp
@@ -605,7 +605,7 @@
       }
       ret = dpps_pu_lock_.WaitFinite(kPuTimeOutMs);
       if (ret) {
-        DLOGE("failed to %s partial update ret %d", ((enable) ? "enable" : "disable"), ret);
+        DLOGW("failed to %s partial update ret %d", ((enable) ? "enable" : "disable"), ret);
         error = kErrorTimeOut;
       }
       break;