The GT system is becoming more and more a stand-alone system in
i915 and it's fair to assign it its own debugfs directory.

rc6, rps and llc debugfs files are gt related, move them into the
gt debugfs directory.
Signed-off-by: NAndi Shyti <andi.shyti@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191222144046.1674865-3-chris@chris-wilson.co.uk