Revert "Allow dump_power to read directories under "/sys/class/p..."

Revert submission 25915320-320613177

Reason for revert: Droidfood blocking bug: 322294676

Reverted changes: /q/submissionid:25915320-320613177
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a5df4f07bf774eb55aab6752aa2e8055f5a4d68e)
Merged-In: I5545dcd73cdce5ae029444c313bf5dc3f642a5c0
Change-Id: I5545dcd73cdce5ae029444c313bf5dc3f642a5c0
2 files changed