x86: sandbox: Add missing PCI bar to barinfo

There are expecte to be bars 0 through 5, but the last of these was
missing leading to an read beyond the buffer. Add the missing element
with zero values.

Signed-off-by: Andrew Scull <ascull@google.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/power/acpi_pmc/pmc_emul.c

@@ -37,6 +37,7 @@ static struct pci_bar {
 	{ 0, 0 },
 	{ 0, 0 },
 	{ PCI_BASE_ADDRESS_SPACE_IO, 256 },
+	{ 0, 0 },
 };
 
 struct pmc_emul_priv {