Fix "Unable to open cpu_type file for reading" for IBM POWER7+
Using operf to do profiling on an IBM POWER7+ may result in
the following error message:
Unable to open cpu_type file for reading
This patch fixes the problem. There is also a simple workaround of
running 'opcontrol --init'.
Signed-off-by: Maynard Johnson <firstname.lastname@example.org>