vboot: remove VbExOverrideGptEntryPriority

This function was added with the sole intended user being
BCB support on the depthcharge side.

Now that BCB is deprecated, we can remove it.

BUG=b:124141368, chromium:956474
TEST=make clean && make runtests
BRANCH=none

Change-Id: I4a99c540951b5e160bf50bcb790091d1df6eefc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1954975
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
4 files changed