init: drop unused header android_filesystem_config.h

Change-Id: I66e637bc2d7fd5f385f40f150becfe515c53c19a
Bug: 27999086
Signed-off-by: William Roberts <william.c.roberts@intel.com>
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 95e4c88..89f6c68 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -48,7 +48,6 @@
 #include <cutils/partition_utils.h>
 #include <cutils/android_reboot.h>
 #include <logwrap/logwrap.h>
-#include <private/android_filesystem_config.h>
 
 #include "action.h"
 #include "bootchart.h"