util: generate fully qualified paths for cscope

Change-Id: I318c185b117b9608110544526fbaaa3fdcdeb8bc
Signed-off-by: Gedare Bloom <gedare@rtems.org>
Reviewed-on: https://gem5-review.googlesource.com/3260
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

cscope-find.py:
Write directly to 'cscope.files' and run 'cscope -b' .
Now this script does everything automatically.
cscope-index.py:
Rename: util/cscope-find.py -> util/cscope-index.py

util/cscope-find.py:
Write directly to 'cscope.files' and run 'cscope -b' .
Now this script does everything automatically.