staging: lustre: remove empty bitmap.h

The file was empty, remove it as it wasn't doing anything.

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>

drivers/staging/lustre/include/linux/libcfs/bitmap.h

@@ -1 +0,0 @@
-

drivers/staging/lustre/lustre/include/obd.h

@@ -50,7 +50,6 @@
 
 #include "lustre/lustre_idl.h"
 #include "lustre_lib.h"
-#include "../../include/linux/libcfs/bitmap.h"
 #include "lu_ref.h"
 #include "lustre_export.h"
 #include "lustre_fid.h"