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/i460-agp.c b/drivers/char/agp/i460-agp.c
index 54191f8..e763d33 100644
--- a/drivers/char/agp/i460-agp.c
+++ b/drivers/char/agp/i460-agp.c
@@ -325,7 +325,7 @@
 
 	io_page_size = 1UL << I460_IO_PAGE_SHIFT;
 	for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
-		paddr = phys_to_gart(page_to_phys(mem->pages[i]));
+		paddr = page_to_phys(mem->pages[i]);
 		for (k = 0; k < I460_IOPAGES_PER_KPAGE; k++, j++, paddr += io_page_size)
 			WR_GATT(j, i460_mask_memory(agp_bridge, paddr, mem->type));
 	}
@@ -382,7 +382,7 @@
 		return -ENOMEM;
 	}
 
-	lp->paddr = phys_to_gart(page_to_phys(lp->page));
+	lp->paddr = page_to_phys(lp->page);
 	lp->refcount = 0;
 	atomic_add(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp);
 	return 0;