staging: lustre: fix more build errors in errno.c

And we need even more .h files to be included to build this file.  So
add kernel.h and module.h, and hopefully that's enough...

Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 0922c008 ("staging: lustre: remove libcfs_all from ptlrpc")
Cc: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>