mailbox: Add device-managed registration functions

Add device-managed equivalents of the mbox_controller_register() and
mbox_controller_unregister() functions that can be used to have the
devres infrastructure automatically unregister mailbox controllers on
driver probe failure or driver removal. This can help remove a lot of
boiler plate code from drivers.

Reviewed-by: Bjorn Andersson <[email protected]>
Reviewed-by: Sudeep Holla <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
Signed-off-by: Jassi Brar <[email protected]>

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