x86: panther: Add PCI and video configuration

Add a PCI node to the device tree. This allows SPI flash and SATA to work
correctly. Also configure the video to come up correctly even though there
is no keyboard.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/configs/chromebox_panther.h b/include/configs/chromebox_panther.h
index 00fe26d..dc732b8 100644
--- a/include/configs/chromebox_panther.h
+++ b/include/configs/chromebox_panther.h
@@ -14,4 +14,6 @@
 /* Avoid a warning in the Realtek Ethernet driver */
 #define CONFIG_SYS_CACHELINE_SIZE 16
 
+#define CONFIG_VGA_AS_SINGLE_DEVICE
+
 #endif	/* __CONFIG_H */