runtime_probe: update memory seccomp policy

Due to libchrome uprev, some functions change their implementation, and
the syscalls they use are also changed accordingly.

BUG=b:161763052
TEST=run memory probe function under minijail without error

Change-Id: I65d8546d2e91077b7e097a743286075818836733
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2334501
Tested-by: Kevin Lin <kevinptt@chromium.org>
Auto-Submit: Kevin Lin <kevinptt@chromium.org>
Reviewed-by: Clark Chung <ckclark@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Commit-Queue: Kevin Lin <kevinptt@chromium.org>
diff --git a/runtime_probe/sandbox/amd64/memory-seccomp.policy b/runtime_probe/sandbox/amd64/memory-seccomp.policy
index a7a1440..af28c95 100644
--- a/runtime_probe/sandbox/amd64/memory-seccomp.policy
+++ b/runtime_probe/sandbox/amd64/memory-seccomp.policy
@@ -7,6 +7,7 @@
 exit_group: 1
 fstat: 1
 getdents: 1
+gettid: 1
 lseek: 1
 openat: 1
 read: 1