Test store & get Secret functionality

Test Store/Get api of SecretManagement HAL. We use a hard coded
hypothetical chain & a dice policy (which the dice chain matches
against) for testing the store/get functionality.

This patch also adds required error codes in SecretManagement.cddl

Bug: 291224769
Test: atest VtsSecretkeeperTargetTest
Change-Id: I0aa2dfc7413791e9de62a6e753bda4ab2f813d2c
3 files changed