[powerpc] collect selected file instead of entire directory

We are collecting powerpc dir from debugfs which is causing
some issues.. Also we don't need that dir data for debugging
purpose... Hence removing that file.

Also collecting selected files from /proc/ppc64 directory
instead of collecting entire directory.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

---
 sos/plugins/powerpc.py |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)