Some VIA VX855 integrated graphics related work

Today I've managed to work on bits and pieces on the minimal support for VX855 graphics such as ensuring the viafb driver works on x86_64 builds as well as a preliminary patch to get VX855 supported by viafb.

I've also played a bit with openchrome and got it to the point where it can display X11 at various resolutions on a CRT (analog VGA out) including hardware accelerated cursor support. The patch is not yet posted, but I hope I'll soon find time to complete this.