procfs: Move proc_fill_super() to fs/proc/root.c

Move proc_fill_super() to fs/proc/root.c as that's where the other
superblock stuff is.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>