kernel_fs_Punybench: fix punybench files path

Punybench has been moved to /opt/punybench, so change the path
definition to correct path.

BUG=None
TEST=Ran the test on nyan

Change-Id: I88b44256d5592b095305bd535118f6ea40e6d60d
Signed-off-by: Penny Chiu <pchiu@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/186872
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
1 file changed