iwlagn: don't use the PCI wrappers for DMA operation

Get a pointer to the struct device during probe and get the rid of all the PCI
specific DMA wrappers.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 72db1a9..eeb31bcf 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -495,9 +495,9 @@
 
 		rxq->queue[i] = NULL;
 
-		pci_unmap_page(priv->pci_dev, rxb->page_dma,
+		dma_unmap_page(priv->bus.dev, rxb->page_dma,
 			       PAGE_SIZE << priv->hw_params.rx_page_order,
-			       PCI_DMA_FROMDEVICE);
+			       DMA_FROM_DEVICE);
 		pkt = rxb_addr(rxb);
 
 		len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
@@ -579,9 +579,9 @@
 		 * rx_free list for reuse later. */
 		spin_lock_irqsave(&rxq->lock, flags);
 		if (rxb->page != NULL) {
-			rxb->page_dma = pci_map_page(priv->pci_dev, rxb->page,
+			rxb->page_dma = dma_map_page(priv->bus.dev, rxb->page,
 				0, PAGE_SIZE << priv->hw_params.rx_page_order,
-				PCI_DMA_FROMDEVICE);
+				DMA_FROM_DEVICE);
 			list_add_tail(&rxb->list, &rxq->rx_free);
 			rxq->free_count++;
 		} else