[PATCH] X60: Add basic ACPI files

[Sven Schnelle]

Hi List,

this patch adds the basic files needed for ACPI support
for the Thinkpad X60 mainboard. Most files are just empty
templates, which are required by coreboot. They will be filled
with code with the next patches.

Right now, most important thing in this patch are the Interrupt
Routing tables.

Signed-off-by: Sven Schnelle