x86: doc: Add DMI to the TODO list

Desktop Management Interface (DMI) is not supported by U-Boot now.
Add it to the TODO list.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

doc/README.x86

@@ -762,6 +762,7 @@ TODO List
 - Audio
 - Chrome OS verified boot
 - SMI and ACPI support, to provide platform info and facilities to Linux
+- Desktop Management Interface (DMI) [15] support
 
 References
 ----------
@@ -779,3 +780,4 @@ References
 [12] http://events.linuxfoundation.org/sites/events/files/slides/chromeos_and_diy_vboot_0.pdf
 [13] http://events.linuxfoundation.org/sites/events/files/slides/elce-2014.pdf
 [14] doc/device-tree-bindings/misc/intel,irq-router.txt
+[15] http://en.wikipedia.org/wiki/Desktop_Management_Interface