defconfig: enable support for VPN

Change-Id: I8868b3d3aea334cdd9487b80c43b96bc40a5e379
Squashed revert of F2FS

Revert "defconfig: enable f2fs"

This reverts commit e0d8ad0a9c0d4babd835c85003dbf15a1cedcb7e.

Revert "f2fs: rename get_node_info to f2fs_get_node_info"

This reverts commit a8d8f8996f9f8a1ea6cdb8b47af23e7644cd9d82.

Revert "add missing posix_acl_create and posix_acl_chmod"

This reverts commit a02fb5a14a747d9dafdd6432690ba08d7cee970d.

Revert "migrate other bio_for_each_segment calls"

This reverts commit dbce5ee273e4a5c5fee5fac1ac9b4cd817736544.

Revert "backport mnt_drop_write_file for 3.0.y"

This reverts commit 284c79797e812b2f9b66b7a85666472791528d7e.

Revert "fs: f2fs: initial import for 3.0.x"

This reverts commit 7491eb2df243f7db17566b81faa088ca0a3c6f17.

Revert "block: Add bio_for_each_segment_all()"

This reverts commit 5ea414ac9fdaf819b5acd4276599f1861530d3b4.

Change-Id: I5dd6ff3dc2989436c5633830db4972a7bb97ef32