fastboot: add support for SELinux and fs_config_func

There were some changes to make_ext4fs to add SELinux context. Also, we
changed the "android" argument to an fs_config_func that allows you to
customize the permissions put into a ext4 filesystem.

Change-Id: If23152c40659122a91771fcbd094f713b38e321e
diff --git a/fastboot/engine.c b/fastboot/engine.c
index 93d24bc..994eeae 100644
--- a/fastboot/engine.c
+++ b/fastboot/engine.c
@@ -257,7 +257,7 @@
 #endif
     reset_ext4fs_info();
     info.len = image->partition_size;
-    make_ext4fs_internal(fd, NULL, NULL, 0, 0, 1, 0, 0, 0);
+    make_ext4fs_internal(fd, NULL, NULL, NULL, 0, 1, 0, 0, 0, NULL);
 
     fstat(fd, &st);
     image->image_size = st.st_size;