pipe: use f_pipe

Pipes use f_version to defer poll notifications until a write has been
observed. Since multiple file's refer to the same struct pipe_inode_info
in their ->private_data moving it into their isn't feasible since we
would need to introduce an additional pointer indirection.

However, since pipes don't require f_pos_lock we placed a new f_pipe
member into a union with f_pos_lock that pipes can use. This is similar
to what we already do for struct inode where we have additional fields
per file type. This will allow us to fully remove f_version in the next
step.

Link: https://lore.kernel.org/r/20240830-vfs-file-f_version-v1-19-6d3e4816aa7b@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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