libyang UPDATE add prefix for common and config files

To avoid include conflicts.
diff --git a/src/validation.c b/src/validation.c
index 35136ad..f150784 100644
--- a/src/validation.c
+++ b/src/validation.c
@@ -22,11 +22,11 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "common.h"
 #include "compat.h"
 #include "diff.h"
 #include "hash_table.h"
 #include "log.h"
+#include "ly_common.h"
 #include "parser_data.h"
 #include "parser_internal.h"
 #include "plugins_exts.h"