Handle inconsistent values for PR_SET_TIMERSLACK_PID in android.os.cts.SeccompTest.

The prctl has different values depending on the kernel version. This CL
backports the seccomp policy change https://codereview.chromium.org/2005183002/
into the Seccomp sample policy.

Bug: 28937004
Change-Id: Ib8aabc4795477ca6b2129f0480b0ac8c7e781b56
Test: `cts-tradefed run cts --class android.os.cts.SeccompTest`
Test: Verified with M-MR2 on flo, shamu, emu-x86, and emu-x86_64
1 file changed