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The IPU and DSP remote processors use sub-mailbox nodes only from a limited set of System Mailboxes 5 and 6 to achieve the Remote Processor Messaging (RPMsg) communication stack between the MPU host processor and the respective remote processor. These are all defined and enabled through the inherited common dra74-ipu-dsp-common.dtsi file. The other System Mailboxes do not define any actual sub-mailboxes, so they serve no purpose and can all be safely dropped. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>