minijail: Support ARM private system calls in seccomp filter policy.

This CL modifies Makefile to add ARM private system calls (__ARM_NR_*)
to the system call table in the generated libsyscalls.gen.c file, such
that the system call '__ARM_NR_<name>' can be referred by the name
'ARM_<name>' in the seccomp filter policy file.

BUG=chromium-os:32825
TEST=Tested the following:
1. FEATURES=test emerge-{x86-mario,lumpy,daisy} chromeos-minijail
2. Run `minijail0 -H` on mario, lumpy, and daisy to verify that the
   expected system calls are supported (including those ARM private
   system calls).
3. Run platform_CrosDisksArchive tests on x86-mario, lumpy, and daisy.

Change-Id: Ib68dc7c20eda25d87e0a7c0656c50184c319a957
Reviewed-on: https://gerrit.chromium.org/gerrit/28129
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Ready: Ben Chan <benchan@chromium.org>
1 file changed