staging/lustre: Remove the "write to FSF to get a copy of GPL" wording

Checkpatch highlighted that some of our Lustre files carry this
extra paragraph and indeed it does seem somewhat redundant, so remove it.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>