Add the pci device

This won't compile of course.
We need to work out our pci calls so we can write the spatches.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Set up ACPI interrupt configuration

This builds and boots, and we seem to get console interrupts,
but not ethernet interrupts (under QEMU). Things need to be fixed.
Only works if you enable CONFIG_MPTABLES (which should be renamed
since we don't parse them, hooray!)

Signed-off-by: Ronald G. Minnich <rminnich@google.com>