CHROMIUM: radv: Enable ETC2 emulation for virgl_render_server

Similar to 16f8fc57869 ("CHROMIUM: radv: Enable ETC2 emulation on
host."), but for virgl_render_server.

This is also a short term override until we have a good place to set the
driconf variable for ARCVM.

BUG=b:202681679
TEST=adb shell cmd gpu vkjson | grep ETC2

Change-Id: Id79b7e9b0080df07522d7c7801de9958c76e73f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mesa/+/3421285
Reviewed-by: Bas Nieuwenhuizen <basni@chromium.org>
Tested-by: Chia-I Wu <olv@google.com>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Chia-I Wu <olv@google.com>
1 file changed