vboot: remove leftover legacy secdata symbols

Remove leftover secdata and secdatak symbols.
secdata_firmware and secdata_kernel should be used instead.

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

Change-Id: I89518242c447253c5a7c332257e126d31d76239c
Cq-Depend: chromium:1967151
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1952562
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
2 files changed