Implement Secretkeeper bootloader client library

The intention is that this will be used by the Android bootloader to
populate pvmfw config data.

Modify test-runner to exercise the API and validate that the response
is in the expected form.

(This is modeled on aosp/1866834 for hwbcc.)

Bug: 291232226
Test: test-runner
  build-root/build-qemu-generic-arm64-test-debug/run --headless &
  --boot-test ""
Change-Id: I9e5ced52e8f0283de7d1a68ac8e8cd4c289c3497
6 files changed
tree: 61b8d6d4eba1364f9fe941a38b528baf4dd59381
  1. interface/
  2. ql-tipc/
  3. test-runner/
  4. .clang-format
  5. PREUPLOAD.cfg