x86: dm: video: Add a framebuffer driver that utilizes VBT

When a VBT is given to an FSP that supports graphics initialization,
the FSP will produce a graphics info HOB that contains all necessary
information for the linear frame buffer of the integrated graphics
device. This adds a DM video driver for it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/lib/fsp/Makefile b/arch/x86/lib/fsp/Makefile
index 3ea4880..afe83dd3 100644
--- a/arch/x86/lib/fsp/Makefile
+++ b/arch/x86/lib/fsp/Makefile
@@ -8,4 +8,5 @@
 obj-y += fsp_car.o
 obj-y += fsp_common.o
 obj-y += fsp_dram.o
+obj-$(CONFIG_VIDEO_FSP) += fsp_graphics.o
 obj-y += fsp_support.o