bootchart2: Don't compile python modules

"make install" may attempt to compile the python modules but it uses the host python
and host paths which means the binaries are not reproducbile. Make things consistent.
If anyone needs compiling, it will beed to be fixed to be cross compile compatible.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 1189f95e)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>