perf: performance analysis tools for Linux

Performance counters for Linux are a new kernel-based subsystem
that provide a framework for all things performance analysis. It
covers hardware level (CPU/PMU, Performance Monitoring Unit) features
and software features (software counters, tracepoints) as well.

To enforce the coupling between userspace and kernel, this
commit introduces perf as a subpackage of the linux-wrs tree.

perf is built directly inside the kernel tree (and hence picks
up all appropriate patches), but is packaged as a separate
utility that can be added to the rootfs and used to analyze
the kernel.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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