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Emulators are difficult to work with, they generally require maintaining some state in a mutable data struct. Since the emulator struct doesn't support a data field like devices do, the pattern seems to be to add it to the configuration. This makes following the logic of where things are difficult. 1. Add a `struct emul *parent` structure to the espi/i2c/spi emulator structs to make it easier when casting up. 2. Add a `void *data` field to `struct emul` to hold the data for emulators. Signed-off-by: Yuval Peress <peress@chromium.org>