- Introduce device-managed registration devm_mbox_controller_un/register and convert drivers to use it

- Introduce flush api to support clients that must busy-wait in atomic context
- Support multiple controllers per device
- Hi3660: a bugfix and constify ops structure
- TI-MsgMgr: off by one bugfix.
- BCM: switch to spdx license
- Tegra-HSP: support for shared mailboxes and suspend/resume.
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