Key US companies have stopped trading with Huawei in a move that can change the entire mobile landscape. The issue may start with Huawei, but it will ripple out to consumers, components suppliers and other smartphone makers. It's hard to predict what will happen going forward, but it's clear that some have much to lose while others have something to gain. Here's a quick rundown. Losers The list starts with Huawei and sub-brand Honor, of course. Current phones as well as some upcoming models will continue working and getting security updates and access to the Google Play store, Google...