x86: qemu: Add graphics support

It turns out that QEMU x86 emulated graphic card has a built-in
option ROM which can be run perfectly with native mode by U-Boot.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/qemu-x86_defconfig b/configs/qemu-x86_defconfig
index 53cb553..4509d52 100644
--- a/configs/qemu-x86_defconfig
+++ b/configs/qemu-x86_defconfig
@@ -5,3 +5,6 @@
 CONFIG_OF_CONTROL=y
 CONFIG_OF_SEPARATE=y
 CONFIG_DEFAULT_DEVICE_TREE="qemu-x86"
+CONFIG_VIDEO_VESA=y
+CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
+CONFIG_FRAMEBUFFER_VESA_MODE_111=y