x86: apl: Support writing the IntelGraphicsMem table

This table is needed by the Linux graphics driver to handle graphics
correctly. Write it to ACPI.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 680f26f..675a43e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1001,4 +1001,12 @@
 config PCIEX_LENGTH_64MB
 	bool
 
+config INTEL_GMA_ACPI
+	bool "Generate ACPI table for Intel GMA graphics"
+	help
+	  The Intel GMA graphics driver in Linux expects an ACPI table
+	  which describes the layout of the registers and the display
+	  connected to the device. Enable this option to create this
+	  table so that graphics works correctly.
+
 endmenu