Remove Android seccomp exemptions

Android previously exempted devices running kernel versions less
than 3.8. Starting with Android N, all devices must support seccomp
with TSYNC.

Remove this exemption from minijail so that failed attempts to apply
a seccomp filter in minijail fail hard.

Change-Id: I15dc2e0a4075783e97f2f3335cca95697c679a55
4 files changed