devtools/td-layout-config: support large payload #692
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The payload may be so large that it cannot be placed in the payload region of the original image config.
To solve this,
LargePayload
is introduced. Since the large payload may have size larger than 16MiB, it is loaded into physical memory instead of ROM space. Thus, in td-layout-config tool, the image configuration is splited into rom configuration and image configuration.