android_filesystem_config: allow absolute paths

SELinux policies use absolute paths, allow absolute paths in fs_config
as well.

Change-Id: Ic97ee0b4eb4df9eac965a8e819fde01df473de7e
diff --git a/include/private/android_filesystem_config.h b/include/private/android_filesystem_config.h
index 3a2500e..f90af81 100644
--- a/include/private/android_filesystem_config.h
+++ b/include/private/android_filesystem_config.h
@@ -236,6 +236,10 @@
     struct fs_path_config *pc;
     int plen;
 
+    if (path[0] == '/') {
+        path++;
+    }
+
     pc = dir ? android_dirs : android_files;
     plen = strlen(path);
     for(; pc->prefix; pc++){