dm: x86: baytrail: Correct PCI region 3 when driver model is used

Commit afbbd413a fixed this for non-driver-model. Make sure that the driver
model code handles this also.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 6747619..db0550b 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -93,6 +93,7 @@
 #endif
 #ifdef CONFIG_PCI
 	struct pci_controller *hose;	/* PCI hose for early use */
+	phys_addr_t pci_ram_top;	/* top of region accessible to PCI */
 #endif
 #ifdef CONFIG_PCI_BOOTDELAY
 	int pcidelay_done;