fwsdk: add opentitantool to the list of packages

opentitantool is necessary for producing image hashes during build,
which in turn is necessary for creation of builder signed Crypto4a HSM
PAOs, which are quorum votes required for GSC images signing.

BUG=b:501562124
TEST=verified that with the appropriate Ti50 changes opentitiantool is
     available during the Bazel build.

Change-Id: Ie245f06ac5e83a2eb5a078088e2bc863d5f1f1c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/7856375
Reviewed-by: Vadím Sukhomlínov <sukhomlinov@google.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Commit-Queue: Vadim Bendebury <vbendeb@google.com>
Tested-by: Vadim Bendebury <vbendeb@google.com>
Commit-Queue: chromeos-auto-runner@chromeos-bot.iam.gserviceaccount.com <chromeos-auto-runner@chromeos-bot.iam.gserviceaccount.com>