In the same fashion like in the Linux kernel, we support pre-initialized
framebuffers that were set up by either the BIOS or the bootloader.
These framebuffers can be backed by any kind of video hardware, and are
not tied to VGA hardware at all. Therefore, this code should be in a
separate sub-folder in the Graphics subsystem to indicate this.
The old methods are already can be considered deprecated, and now after
we removed framebuffer devices entirely, we can safely remove these
methods too, which simplfies the GenericGraphicsAdapter class a lot.
