drm/virtio: Add capset definitions to UAPI

Since the context-type additions to the virtio-gpu spec, these have been
defined locally in guest user-space, and virtio-gpu backend library code.

Now, these capsets have been stabilized, and should be defined in a
common space, in both the virtio_gpu header, and alongside the virtgpu_drm
interface that they apply to.

Reviewed-by: Gurchetan Singh <[e-mail]>
Signed-off-by: Aaron Ruby <[e-mail]>
Signed-off-by: Dmitry Osipenko <[e-mail]>
[[e-mail]: edit commit title]
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

include/uapi/drm/virtgpu_drm.h

···
 	__u32 flags;
 };
 
+#define VIRTGPU_DRM_CAPSET_VIRGL 1
+#define VIRTGPU_DRM_CAPSET_VIRGL2 2
+#define VIRTGPU_DRM_CAPSET_GFXSTREAM_VULKAN 3
+#define VIRTGPU_DRM_CAPSET_VENUS 4
+#define VIRTGPU_DRM_CAPSET_CROSS_DOMAIN 5
+#define VIRTGPU_DRM_CAPSET_DRM 6
 struct drm_virtgpu_get_caps {
 	__u32 cap_set_id;
 	__u32 cap_set_ver;

include/uapi/linux/virtio_gpu.h

···
 
 #define VIRTIO_GPU_CAPSET_VIRGL 1
 #define VIRTIO_GPU_CAPSET_VIRGL2 2
-/* 3 is reserved for gfxstream */
+#define VIRTIO_GPU_CAPSET_GFXSTREAM_VULKAN 3
 #define VIRTIO_GPU_CAPSET_VENUS 4
+#define VIRTIO_GPU_CAPSET_CROSS_DOMAIN 5
 #define VIRTIO_GPU_CAPSET_DRM 6
 
 /* VIRTIO_GPU_CMD_GET_CAPSET_INFO */