Fix nvme initiator handling when not enabled.

Fix nvme initiator handline when CONFIG_LPFC_NVME_INITIATOR is not enabled.

With update nvme upstream driver sources, loading
the driver with nvme enabled resulting in this Oops.

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
 IP: lpfc_nvme_update_localport+0x23/0xd0 [lpfc]
 PGD 0
 Oops: 0000 [#1] SMP
 CPU: 0 PID: 10256 Comm: lpfc_worker_0 Tainted
 Hardware name: ...
 task: ffff881028191c40 task.stack: ffff880ffdf00000
 RIP: 0010:lpfc_nvme_update_localport+0x23/0xd0 [lpfc]
 RSP: 0018:ffff880ffdf03c20 EFLAGS: 00010202

Cause: As the initiator driver completes discovery at different stages,
it call lpfc_nvme_update_localport to hint that the DID and role may have
changed.  In the implementation of lpfc_nvme_update_localport, the driver
was not validating the localport or the lport during the execution
of the update_localport routine.  With the recent upstream additions to
the driver, the create_localport routine didn't run and so the localport
was NULL causing the page-fault Oops.

Fix: Add the CONFIG_LPFC_NVME_INITIATOR preprocessor inclusions to
lpfc_nvme_update_localport to turn off all routine processing when
the running kernel does not have NVME configured.  Add NULL pointer
checks on the localport and lport in lpfc_nvme_update_localport and
dump messages if they are NULL and just exit.
Also one alingment issue fixed.
Repalces the ifdef with the IS_ENABLED macro.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>