qemu: cgroup: gfx: egl-headless: Add the DRI device into the cgroup list

Just like for SPICE, we need to put the render node DRI device into the
device cgroup list so that users don't need to add it manually via
qemu.conf file.
Signed-off-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_cgroup.c

@@ -491,15 +491,11 @@ qemuSetupGraphicsCgroup(virDomainObjPtr vm,
                         virDomainGraphicsDefPtr gfx)
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
-    const char *rendernode = gfx->data.spice.rendernode;
+    const char *rendernode = virDomainGraphicsGetRenderNode(gfx);
     int ret;
 
-    if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
-        return 0;
-
-    if (gfx->type != VIR_DOMAIN_GRAPHICS_TYPE_SPICE ||
-        gfx->data.spice.gl != VIR_TRISTATE_BOOL_YES ||
-        !rendernode)
+    if (!rendernode ||
+        !virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
         return 0;
 
     ret = virCgroupAllowDevicePath(priv->cgroup, rendernode,