Migrate devicelab from A02s's and MotoG4's to Mokey's about flutter HOT 7 OPEN

Marking team-infra, but this will get sorted out between me, @jonahwilliams, and @kentnguyen99

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@zanderso, Please let me know when your teams ready to switch the phone devices from A02s and MotoG4s to new Mokey's phone devices. And also, which phone model to switch out first, A02s or MotoG4s?

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Sounds like we have 20 devices so far. I think the sticky note on my desk claims we'll need 3X devices, so I'll flash the rest next week.

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@zanderso the box next to your desk is full of all of the flashed mokey devices that are ready for the devicelab

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@jonahwilliams Just want to make correction. There are 18 Mokey devices in the Devicelab, one device won't charge and other device different model was missed up in the pile.

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We don't currently have much running on the a02s's. After #148563 lands, they can all be swapped out for mokeys.

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After #149567, one test is failing consistently on the mokey #149666

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