commit 87fd22e0 ("s390/ipl: add eckd support") missed to add the
loadparm attribute to the new eckd ipl/reipl data.

Fixes: 87fd22e0 ("s390/ipl: add eckd support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>