Enable fstat to seccomp filter for x86_64

bug: 120238328
Test: run CTS case - android.security.cts.ProcessMustUseSeccompTest

Change-Id: I08ac4d75d77061a48641973cff61d51fee3c5c28
diff --git a/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy b/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
index 6d9ed6f..35ac458 100644
--- a/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
+++ b/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
@@ -21,6 +21,7 @@
 getuid: 1
 setpriority: 1
 sigaltstack: 1
+fstat: 1
 fstatfs: 1
 newfstatat: 1
 restart_syscall: 1