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Add a simplebus-based pseudo-bus that matches the "reserved-memory" node in the device tree. Update the SCMI shared memory driver so that it can attach either as a child of mmio_sram or directly under simplebus (via the new reserved-memory bus). Make the mmio_sram memory resource shareable so both attachment methods can coexist when required. MFC after: 1 week Reviewed by: manu