Andrii Pauk authored Dec 22, 2021 and Gurchetan Singh committed Mar 14, 2022

Add support of GUEST_VRAM type of blob. These are dedicated heap memory
allocations required for vk support on hypervisors that don't support
runtime injections of host memory into guest physical address space.

The flow of usage:
1) Host VM reserves dedicated heap memory in it's dts
2) Device get info about memory reservations and report it to guest using
new mmio registers
3) Guest virtio-gpu driver on starts checks new mmio registers for physical
address and length of reserved region. Then it reserves it in guest.
4) On create_blob drm ioctl guest driver gets chunk of required memory and
send it to host using sg list. It uses one sg entry for 1 blob call. Heap
is managed on guest using drm memory manager (drm_mm).

Signed-off-by: Andrii Pauk <Andrii.Pauk@opensynergy.com>