AnandTech has a graph of iPad Air A7 power consumption during a power-hungry test. So in this case, would ~8 W (peak platform power – idle power) be close to the EDP and ~7 W be close to the TDP?
I'd like to stand corrected but I doubt that even the A7's theoretical peak SoC consumption would be at "just" 8W. The graph you're linking to shows a max power a tad lower than 12W for the A7 so I wouldn't be at all surprised if the A7 TDP is even higher than 12W.