drm/msm/sde: remove unnecessary debugfs from sde-kms

Remove unnecessary debugfs nodes from sde-kms layer, in
particular the QOS values from TOP block.  UIDLE provides
the same danger/safe values reported by the danger/safe
in TOP block.

Change-Id: I77fa5428f23c059ee37f4f3de00f1d98b84e5c61
Signed-off-by: Steve Cohen <cohens@codeaurora.org>