x86: baytrail: pci region 3 is not always mapped to end of ram

Baytrail physically maps the first 2 GB of SDRAM from 0x0 to 0x7FFFFFFF
and additional SDRAM is mapped from 0x100000000 and up.  There is a
physical memory hole from 0x80000000 to 0xFFFFFFFF for other uses.
Because of this, PCI region 3 should only try to use up to the amount of
SDRAM or 0x80000000, which ever is less.
Signed-off-by: NAndrew Bradford <andrew.bradford@kodakalaris.com>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Acked-by: NSimon Glass <sjg@chromium.org>

arch/x86/cpu/baytrail/pci.c

@@ -39,7 +39,7 @@ void board_pci_setup_hose(struct pci_controller *hose)
 	pci_set_region(hose->regions + 3,
 		       0,
 		       0,
-		       gd->ram_size,
+		       gd->ram_size < 0x80000000 ? gd->ram_size : 0x80000000,
 		       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 
 	hose->region_count = 4;