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/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index e85a5b3..2fb2e6c 100644
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -79,7 +79,7 @@
 
 	for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 		tmp = agp_bridge->driver->mask_memory(agp_bridge,
-						      phys_to_gart(page_to_phys(mem->pages[i])),
+						      page_to_phys(mem->pages[i]),
 						      mask_type);
 
 		BUG_ON(tmp & 0xffffff0000000ffcULL);
@@ -178,7 +178,7 @@
 
 static int amd_8151_configure(void)
 {
-	unsigned long gatt_bus = virt_to_gart(agp_bridge->gatt_table_real);
+	unsigned long gatt_bus = virt_to_phys(agp_bridge->gatt_table_real);
 	int i;
 
 	/* Configure AGP regs in each x86-64 host bridge. */
@@ -558,7 +558,7 @@
 {
 	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 
-	release_mem_region(virt_to_gart(bridge->gatt_table_real),
+	release_mem_region(virt_to_phys(bridge->gatt_table_real),
 			   amd64_aperture_sizes[bridge->aperture_size_idx].size);
 	agp_remove_bridge(bridge);
 	agp_put_bridge(bridge);