bdb: Add vboot_register.h
bdb: Add vboot_register.h

vboot_register.h lists definitions for vboot registers. Vboot registers
are used to transfer information between modules (coreboot & depthcharge)
or boots.

BUG=chrome-os-partner:51907
BRANCH=tot
TEST=make runtests

Change-Id: Ie0876fefb43d3e79a8f96e8f25f99f798892a056
Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/342603

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot