staging: lustre: remove kp30.h

It's empty, so remove it and move the #include lines into the one file
that used to include this header.

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