misc: mpfs_syscontroller: add mailbox RX helper for service responses

The MPFS system controller run_service() helper only submits the mailbox
request but does not read back the response data. However, the caller
must explicitly receive the response.

Add a public system controller helper to receive mailbox service
responses to populate the response buffer after issuing a system
controller request.

Without this, the drivers copy uninitialised stack data instead of
mailbox response data, resulting in deterministic output.

Signed-off-by: Jamie Gibbons <[email protected]>
Acked-by: Conor Dooley <[email protected]>

0 files changed, 0 insertions, 0 deletions