Add powerd to debugfs-access group.

Powerd needs to access /sys/kernel/debug/ for s0ix residency files.

BUG=b:126576620
TEST=build and install image on nocturne.
CQ-DEPEND=CL:1554895

Change-Id: I237843748c6f02b615186dd0fa2806f30b6be242
Reviewed-on: https://chromium-review.googlesource.com/1554453
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Ravi Chandra Sadineni <ravisadineni@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
diff --git a/profiles/base/accounts/group/debugfs-access b/profiles/base/accounts/group/debugfs-access
index fc83503..63d4395 100644
--- a/profiles/base/accounts/group/debugfs-access
+++ b/profiles/base/accounts/group/debugfs-access
@@ -1,3 +1,3 @@
 group:debugfs-access
 gid:605
-users:arc-camera,shill
+users:arc-camera,shill,power