spdm: Implement requester finish command

BUG=b:335386464
TEST=spdm unittests

Change-Id: I403a6581a659065d3f80d66834458e4d9f859581
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/spdm/+/5488679
Reviewed-by: Vadim Sukhomlinov <sukhomlinov@google.com>
Tested-by: Howard Yang <hcyang@google.com>
Commit-Queue: Howard Yang <hcyang@google.com>
5 files changed