bluetooth: Add function to read last commit hash

BUG=b:150413806
TEST=Run bluetooth tests

Change-Id: Ifad3641cdbe7f1bb633186a745bae386e53bcf6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/chameleon/+/2202750
Reviewed-by: Shyh-In Hwang <josephsih@chromium.org>
Commit-Queue: Shijin Abraham <shijinabraham@google.com>
Tested-by: Shijin Abraham <shijinabraham@google.com>
2 files changed