mediacodec-x86.policy: Allow media.omx to call statfs64 on x86 platform

After using std::thread in MojoThread, 'statfs64' needs to be called in media.omx initialization.
This adds statfs64 to system calls list that media.omx process is allowed to execute.

Bug: 110722333
Test: m
Change-Id: I79d9223cb4189941001abdce5456c4c5e9f9ffe1
diff --git a/services/mediacodec/seccomp_policy/mediacodec-x86.policy b/services/mediacodec/seccomp_policy/mediacodec-x86.policy
index 6e6b276..4031b11 100644
--- a/services/mediacodec/seccomp_policy/mediacodec-x86.policy
+++ b/services/mediacodec/seccomp_policy/mediacodec-x86.policy
@@ -24,6 +24,7 @@
 mmap2: 1
 fstat64: 1
 stat64: 1
+statfs64: 1
 madvise: 1
 fstatat64: 1
 futex: 1