agp: kill phys_to_gart() and gart_to_phys()

There seems to be no reason for these -- they're a 1:1 mapping on all
platforms.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/char/agp/ati-agp.c b/drivers/char/agp/ati-agp.c
index 59ebd60..3b2ecbe 100644
--- a/drivers/char/agp/ati-agp.c
+++ b/drivers/char/agp/ati-agp.c
@@ -302,7 +302,7 @@
 		addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 		cur_gatt = GET_GATT(addr);
 		writel(agp_bridge->driver->mask_memory(agp_bridge,	
-						       phys_to_gart(page_to_phys(mem->pages[i])),
+						       page_to_phys(mem->pages[i]),
 						       mem->type),
 		       cur_gatt+GET_GATT_OFF(addr));
 	}
@@ -360,7 +360,7 @@
 
 	agp_bridge->gatt_table_real = (u32 *)page_dir.real;
 	agp_bridge->gatt_table = (u32 __iomem *) page_dir.remapped;
-	agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);
+	agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
 
 	/* Write out the size register */
 	current_size = A_SIZE_LVL2(agp_bridge->current_size);
@@ -390,7 +390,7 @@
 
 	/* Calculate the agp offset */
 	for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
-		writel(virt_to_gart(ati_generic_private.gatt_pages[i]->real) | 1,
+		writel(virt_to_phys(ati_generic_private.gatt_pages[i]->real) | 1,
 			page_dir.remapped+GET_PAGE_DIR_OFF(addr));
 		readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));	/* PCI Posting. */
 	}