Simpleperf: support branch stack sampling in `simpleperf record`.

This only adds support in simpleperf. Branch stack sampling still
lacks kernel support on arm devices.
Use perf_event.h of bionic in host build, because the perf_event.h
of platform glibc is too old.

Bug: 19483574
Change-Id: I9c7332c054e93e7433717dd293d3f366b1802e2d
8 files changed