init: Move parser prototypes to parser.h

Change-Id: I31db51eb8e8a33a0bd06b41206bc9f9147d16d41
diff --git a/init/builtins.c b/init/builtins.c
index b4af700..8e5eed8 100644
--- a/init/builtins.c
+++ b/init/builtins.c
@@ -35,6 +35,7 @@
 #include "keywords.h"
 #include "property_service.h"
 #include "devices.h"
+#include "parser.h"
 
 #include <private/android_filesystem_config.h>