seccomp: gpu: allow sched_yield

It will be needed by virglrenderer with venus enabled.

BUG=b:180621453
TEST=vulkan-smoketest

Change-Id: I3c3b4f38901d278c137b26f8801a3417d88b4533
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2728307
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Chia-I Wu <olv@google.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>
Commit-Queue: Chia-I Wu <olv@google.com>
diff --git a/seccomp/x86_64/gpu_device.policy b/seccomp/x86_64/gpu_device.policy
index e547c35..7f167d7 100644
--- a/seccomp/x86_64/gpu_device.policy
+++ b/seccomp/x86_64/gpu_device.policy
@@ -96,3 +96,6 @@
 access: 1
 getgid: 1
 getegid: 1
+
+# Rules for virglrenderer
+sched_yield: 1