drivers: i2c: Add a dump routine
Add a function to dump out a set of I2C messages. It uses debug logging
so it only useful for debugging.
Signed-off-by: 
Simon Glass <sjg@chromium.org>
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Add a function to dump out a set of I2C messages. It uses debug logging
so it only useful for debugging.
Signed-off-by: Simon Glass <sjg@chromium.org>