x86: Add initial video device init for Intel GMA

Intel's Graphics Media Accelerator (GMA) is a generic name for a wide range
of video devices. Add code to set up the hardware on ivybridge. Part of the
init happens in native code, part of it happens in a 16-bit option ROM for
those nostalgic for the 1970s.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/fdtdec.h b/include/fdtdec.h
index b6e1d40..ea92894 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -122,6 +122,7 @@
 	COMPAT_MEMORY_SPD,		/* Memory SPD information */
 	COMPAT_INTEL_PANTHERPOINT_AHCI,	/* Intel Pantherpoint AHCI */
 	COMPAT_INTEL_MODEL_206AX,	/* Intel Model 206AX CPU */
+	COMPAT_INTEL_GMA,		/* Intel Graphics Media Accelerator */
 
 	COMPAT_COUNT,
 };