staging: lustre: remove linux-tcpip.h

There were just a few macros being used, remove them and have the places
where they were being used to make the proper kernel api call instead.

Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: hpdd-discuss <hpdd-discuss@lists.01.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>