log splitter: move non namespace messages to lava-common file

Moved non namespace messages to lava-common file.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I69dba97e31ed0d406326e8f4afad0b3ed795606a
diff --git a/tf-a-builder/log-splitter.py b/tf-a-builder/log-splitter.py
index edf8f51..bc5e586 100755
--- a/tf-a-builder/log-splitter.py
+++ b/tf-a-builder/log-splitter.py
@@ -68,8 +68,8 @@
                 msg = line["msg"]
                 dt  = line["dt"]
                 if (level == "target") or (level == "feedback"):
-                    namespace = line["ns"] if "ns" in line else level
 
+                    namespace = line["ns"] if "ns" in line else "common"
                     if namespace not in opened_logfile:
                         des_log_file = f"{des_dir}/lava-{namespace}.log"
                         opened_logfile[namespace] = open(des_log_file, "w")