Implement the show_options superblock op for bpf as part of a bid to get
rid of s_options and generic_show_options() to make it easier to implement
a context-based mount where the mount options can be passed individually
over a file descriptor.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Alexei Starovoitov <ast@xxxxxxxxxx>
cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
cc: netdev@xxxxxxxxxxxxxxx