vboot/secdata: rename rollback_index to secdata_tpm

These secure spaces are now used for more than just rollback
versions and should be renamed thus.

Note: Originally this rename operation was batched into the CL
which rewrites the functions in rollback_index/secdata_tpm, but
it made reviewing in Gerrit a pain, since it couldn't pick up on
the file renames, and instead showed them as deletes/adds.

Doing the rename separately helps ensure all references to
rollback_index are updated, and gives us a better review
experience in Gerrit.

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

Change-Id: I51e5c731e0d7a071d384c28da56e7adce64ba943
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1776279
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
22 files changed