powertop: Remove this addon as it does not work without debug_fs enabled

powertop: Remove this addon as it does not work without debug_fs enabled

- powertop requires debug_fs to be enabled in the kernel for it to function. In Core
   Update 171 debug_fs was disabled as a security risk for a firewall application.
- Based on the above powertop has stopped functioning since Core Update 171. Discussed
   at IPFire Developers monthly conf call for April and agreed to remove the addon as
   debug_fs will not be re-enabled.
- removal of lfs and rootfiles and removal of powertop line in make.sh

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Acked-by: Michael Tremer <michael.tremer@ipfire.org>