scsi: arcmsr: Deprecate using arcmsr_pci_unmap_dma()

Stop using arcmsr_pci_unmap_dma() and call scsi_dma_unmap() directly.

Signed-off-by: ching Huang <ching2048@areca.com.tw>
Link: https://lore.kernel.org/r/17c235f2fff960aefea33b50039e214f42164130.camel@areca.com.tw
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>