Avoid copying textures (other buffers?) between device VM and driver VM:

• previous attempt was to eglimport textures from drivers VM
• new attempt can be host allocation as crosvm is doing, but need to implement this in scope of pre-defined VRAM for security reason

Related confluence of this topic can be found at:
[VIRT-005] Realize Zero-Copy for VirtIO-GPU (3d mode)