WIP: Virgl: add get device reset status and enable the creation of contexts with robustness
This series implements querying the (host) reset status and enables EGL_EXT_create_context_robustness.
It has been tested with vtest, for this it needs !1578 (this MR includes these patches, hence WIP)
Open questions are whether the guest should also go through a reset after the host context was lost, or whether this is not needed.
The host side patches are virgl/virglrenderer!268