ahci/xgene: Remove logic to set 64-bit DMA mask

Instead of doing the check here, this should be handled
in the common AHCI platform code.

Signed-off-by: Suravee Suthikulpanit <[e-mail]>
Suggested-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Cc: Loc Ho <[e-mail]>
Cc: Tuan Phan <[e-mail]>
Cc: Suman Triphati <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

drivers/ata/ahci_xgene.c

···
 	/* Configure the host controller */
 	xgene_ahci_hw_init(hpriv);
 
-	/*
-	 * Setup DMA mask. This is preliminary until the DMA range is sorted
-	 * out.
-	 */
-	rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
-	if (rc) {
-		dev_err(dev, "Unable to set dma mask\n");
-		goto disable_resources;
-	}
-
 	hflags = AHCI_HFLAG_NO_PMP | AHCI_HFLAG_YES_NCQ;
 
 	rc = ahci_platform_init_host(pdev, hpriv, &xgene_ahci_port_info,