HID: amd_sfh: Remove useless DMA-32 fallback configuration

As stated in [1], dma_set_mask() with a 64-bit mask never fails if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

Simplify code and remove some dead code accordingly.

[1]: https://lore.kernel.org/linux-kernel/YL3vSPK5DXTNvgdx@infradead.org/#t

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Author: tititiou36

drivers/hid/amd-sfh-hid/amd_sfh_pcie.c

@@ -248,11 +248,8 @@ static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *i
 	pci_set_master(pdev);
 	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (rc) {
-		rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (rc) {
-			dev_err(&pdev->dev, "failed to set DMA mask\n");
-			return rc;
-		}
+		dev_err(&pdev->dev, "failed to set DMA mask\n");
+		return rc;
 	}
 
 	privdata->cl_data = devm_kzalloc(&pdev->dev, sizeof(struct amdtp_cl_data), GFP_KERNEL);