initrd_start must not point at the location the initrd is loaded into
the crashkernel memory but at the location it will be after the
crashkernel memory is swapped with the memory at 0.

Fixes: ee337f54 ("s390/kexec_file: Add crash support to image loader")
Reported-by: NLianbo Jiang <lijiang@redhat.com>
Signed-off-by: NPhilipp Rudo <prudo@linux.ibm.com>
Tested-by: NLianbo Jiang <lijiang@redhat.com>
Link: https://lore.kernel.org/r/20200512193956.15ae3f23@laptop2-ibm.localSigned-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NVasily Gorbik <gor@linux.ibm.com>