init: Move prototypes for util.c into util.h

Change-Id: I46a91849ce5297eb2597dd6134412f817564ec24
diff --git a/init/property_service.c b/init/property_service.c
index 28160f8..b1c6552 100644
--- a/init/property_service.c
+++ b/init/property_service.c
@@ -43,6 +43,7 @@
 
 #include "property_service.h"
 #include "init.h"
+#include "util.h"
 
 #define PERSISTENT_PROPERTY_DIR  "/data/property"