rambi: add BSP lapic device

There's some baked in assumptions internal to coreboot
that the BSP's cpu device exists in the device tree. Therefore
provide one in the device tree.

BUG=chrome-os-partner:22862
BRANCH=None
TEST=Compiled and booted with other changes.

Change-Id: I22ba10964760ee8efbc5bbd5d4ce65daf31b3839
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/173702
Reviewed-on: http://review.coreboot.org/4887
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
1 file changed