Merge patch series "fs: start to split up fs.h"

Christian Brauner <brauner@kernel.org> says:

Take first steps to split up fs.h. Add fs/super_types.h and fs/super.h
headers that contain the types and functions associated with super
blocks respectively.

* patches from https://patch.msgid.link/20251104-work-fs-header-v1-0-fb39a2efe39e@kernel.org:
  fs: add fs/super.h header
  fs: add fs/super_types.h header
  fs: rename fs_types.h to fs_dirent.h

Link: https://patch.msgid.link/20251104-work-fs-header-v1-0-fb39a2efe39e@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>