x86: ivybridge: Fix types for 64-bit compilation

Fix a few types that causes warnings on 64-bit machines.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/video/ivybridge_igd.c b/drivers/video/ivybridge_igd.c
index 95d62a5..f16d725 100644
--- a/drivers/video/ivybridge_igd.c
+++ b/drivers/video/ivybridge_igd.c
@@ -802,7 +802,7 @@
 	mtrr_add_request(MTRR_TYPE_WRCOMB, base, 256 << 20);
 	mtrr_commit(true);
 
-	gtt_bar = (void *)dm_pci_read_bar32(dev, 0);
+	gtt_bar = (void *)(ulong)dm_pci_read_bar32(dev, 0);
 	debug("GT bar %p\n", gtt_bar);
 	ret = gma_pm_init_pre_vbios(gtt_bar, rev);
 	if (ret)
@@ -824,7 +824,7 @@
 		return ret;
 
 	/* Post VBIOS init */
-	gtt_bar = (void *)dm_pci_read_bar32(dev, 0);
+	gtt_bar = (void *)(ulong)dm_pci_read_bar32(dev, 0);
 	ret = gma_pm_init_post_vbios(dev, rev, gtt_bar);
 	if (ret)
 		return ret;