libhwminijail from hardware/interfaces to libhidl.

This library is not a hardware interface, so it doesn't
belong directly in hardware/interfaces. Moving it to
libhidl because it is intended to be a helper library for
hal implementations that want to use minijail/seccomp.

Test: pass
Change-Id: Id435c70ef9483006e09896be81d5f9600b758e47
4 files changed