Staging: lustre: obdclass: Remove unused functions

Remove dump_exports and print_export_data as they are defined
but not used anywhere.

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>