vmware-vga: Remove dead DIRECT_VRAM mode The code was disabled since day 1 of vmware-vga, and now it does not even build anymore. Time for a cleanup. CC: Andrzej Zaborowski <balrogg@gmail.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>