vboot/secdata: rename secdata and secdatak

For clarity's sake, rename:
  secdata -> secdata_firmware
  secdatak -> secdata_kernel

secdata is now the general term to refer to any secure data
spaces: firmware, kernel, and FWMP.

Once coreboot code has been updated, the sections in 2api.h
and 2constants.h may be removed.

BUG=b:124141368, chromium:972956
TEST=make clean && make runtests

Change-Id: I376acee552e8be37c75c340626a95462f81e198b
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1773079
Reviewed-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
33 files changed