vboot/tpm2_lite: add FIRMWARE_NV_INDEX definition
vboot/tpm2_lite: add FIRMWARE_NV_INDEX definition

Add a FIRMWARE_NV_INDEX definition, and stop including the
secdata_tpm.h header, which will soon be embarking on a new
journey in depthcharge.

It would be nice if we could avoid our TPM library knowing
about specific space indices used by vboot.  Leaving that
as something to worry about in the future: chromium:1032930.

BUG=b:124141368, chromium:972956, chromium:1032930
TEST=make clean && make runtests
BRANCH=none

Change-Id: I99bb04bbc2f4eef28cbe51ecf506078583238074
Signed-off-by: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1958068
Tested-by: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>
Auto-Submit: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>
Reviewed-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>
Commit-Queue: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>

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