Re: Generic pedantic reply...
Err... most of this devices don't require GPU support, or even a GPU. Not every Android device has an nVidia CPU or GPU and the ones that do are mobile class and the relevant support is provided (because mobiles have bigger userbase and are profitable).
nVidia shouldn't have to add support just because the minority asks for it. When and if Linux is dominant on the desktop, then nVidia will listen, until there is profit, why should it? It's up to Linux users to build market share on the merits of the user applciations available on Linux, which in turn can drive hardware development, just as it happened on Windows. On Windows, it is video gaming that pushes GPU support. Perhaps Linux developers should try and create Linux only games with the same production quality of DirectX games to grab share from the Windows (and Apple) consumer market. If you think about it, Android is doing that already, but it'll be small steps and at the same time Microsoft will continue to increase its lead.