good question, my last tablet was x86 and the one before was android
Currently, there is no processors would manage TDP within 2W for tablet computers such as those ones of Intel Atom. So there is almost no tablet computers using AMD processors. The new coming AMD Ryzen is not for tablet computers too. So there might be a little bit longer journey to expect such thing appear. But there is another interesting thing from AMD, ARM processors! Yeah, AMD also manufactures ARM64 processors for servers. So Android power tablets might have a lot of room to choose the AMD processors in the future.