chromeos-bsp-elm: disable dark resume

Elm overlay is cut from oak at a point where dark resume is enabled.
Disable it on Elm. The dark_resume_sources is also synced with
chromeos-bsp-oak.

BUG=chrome-os-partner:43894,chrome-os-partner:56132
TEST=`emerge-elm chromeos-bsp-elm` and make sure disable_dark_resume is
     installed in /build/elm/usr/share/power_manager/board_specific

Change-Id: I871811f893ab0c9081ddcd70f7d194297b979b12
Reviewed-on: https://chromium-review.googlesource.com/368140
Commit-Ready: Wei-Ning Huang <wnhuang@chromium.org>
Tested-by: Wei-Ning Huang <wnhuang@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/377058
Reviewed-by: Wei-Ning Huang <wnhuang@chromium.org>
Commit-Queue: Wei-Ning Huang <wnhuang@chromium.org>
diff --git a/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/dark_resume_sources b/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/dark_resume_sources
index fedb5ed..3140334 100644
--- a/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/dark_resume_sources
+++ b/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/dark_resume_sources
@@ -1,2 +1,2 @@
 /sys/class/rtc/rtc0/device
-/sys/devices/mwifiex
+/sys/bus/sdio/drivers/mwifiex_sdio/mmc2:0001:1
diff --git a/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/disable_dark_resume b/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/disable_dark_resume
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/overlay-elm/chromeos-base/chromeos-bsp-elm/files/powerd_prefs/disable_dark_resume
@@ -0,0 +1 @@
+1