gpu_renderer: update bindings
gpu_renderer: update bindings

Use virglrenderer to get the metadata associated with a buffer.
We must do this before we allocate the guest kernel pages, so
they agree with host requirements. This implements the rough API
outlined here:

https://gitlab.freedesktop.org/virgl/virglrenderer/issues/119

Probably we want this in virv-renderer eventually, but that may take
some time, so for prototyping just use non-upstreamed virglrenderer
functions.

BUG=chromium:924405
TEST=compile

Change-Id: If78f274c813c2131b297144172019848806e3a0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1790831
Tested-by: Gurchetan Singh <99434bba058e25b6203b8ae055a4f697dad0ef64@chromium.org>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Auto-Submit: Gurchetan Singh <99434bba058e25b6203b8ae055a4f697dad0ef64@chromium.org>
Reviewed-by: Zach Reizner <3374927928a53d04457674c546bd4de57c2044ec@chromium.org>
Commit-Queue: Gurchetan Singh <99434bba058e25b6203b8ae055a4f697dad0ef64@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm