staging: lustre: move remaining code from linux-module.c to module.c

There is no longer any need to keep this code separate,
and now we can remove linux-module.c

Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>