s390/diag: add missing virt_to_phys() translation to diag224()

Diagnose 224 expects a physical address, but all users pass a virtual
address. Translate the address to fix this.

Reported-by: Mete Durlu <meted@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>