Remove android.security.cts.SeccompBpfTest.

This is obsolete now that the kernel-level unittests run as part of
android.os.cts (c.f. I607195da52df24c39366b34cb1f5caddf6217b8b).

Bug: 21396275
Change-Id: Iaa18f92709418c73bbd61edeae83bd9f7845f1bb
5 files changed