firmware: arm_scpi: make freeing mbox channels device-managed
Make freeing the mbox channels device-managed, thus further simplifying scpi_remove and and one further step to get rid of scpi_remove. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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