scsi: lpfc: use div_u64 for 64-bit division

The new debugfs output causes a link error on 32-bit architectures:

ERROR: "__aeabi_uldivmod" [drivers/scsi/lpfc/lpfc.ko] undefined!

This code is not performance critical, so we can simply use div_u64().

[mkp: fixed up whitespace]

Fixes: bd2cdd5e ("scsi: lpfc: NVME Initiator: Add debugfs support")
Fixes: 2b65e182 ("scsi: lpfc: NVME Target: Add debugfs support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>