mctp-controller-init-v3: Adds MCTP init for a new platform Inherits from mctp-controller-init-v2 with modifications specific to the new platform bringup. This should be consolidated with v2. v3 was introduced to reduce testing scope at the early phase. Tested: Verified working on the new platform. fusion2: N/A Google-Bug-Id: 487277222 Change-Id: Ieeb7ec0d3063d558b966e2bff74ccbc7eb1fa17c Signed-off-by: Luka Strizic <lstrz@google.com>