seccomp: allow open for x86_64 arch

BUG: 122902673
Test:
lunch sdk_gphone_x86_64-userdebug
make -j
emulator

mediaextractor should not be killed by minijail anymore

Change-Id: I0e2547376fb6e8d6a7e9316c6013cedf6a9cdeac
diff --git a/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy b/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
index 63c7780..32299f3 100755
--- a/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
+++ b/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
@@ -11,6 +11,7 @@
 mmap: 1
 madvise: 1
 openat: 1
+open: 1
 clock_gettime: 1
 writev: 1
 brk: 1