Use GID "wakelock" to control access to kernel wakelock

Bug: 25864142
Change-Id: I97628282a23cb7fe0936c69f3a67a81c2afed60c
diff --git a/init.hammerhead.rc b/init.hammerhead.rc
index e625020..07f1ff8 100644
--- a/init.hammerhead.rc
+++ b/init.hammerhead.rc
@@ -274,7 +274,7 @@
 service rmt_storage /system/bin/rmt_storage
     class core
     user root
-    group system
+    group system wakelock
 
 service bridgemgrd /system/bin/bridgemgrd
     class main
@@ -285,7 +285,7 @@
 service qmuxd /system/bin/qmuxd
     class main
     user radio
-    group radio audio bluetooth gps
+    group radio audio bluetooth wakelock gps
 
 service netmgrd /system/bin/netmgrd
     class main
@@ -295,7 +295,7 @@
 service sensors /system/bin/sensors.qcom
     class main
     user root
-    group root
+    group root wakelock
 
 service irsc_util /system/bin/irsc_util "/etc/sec_config"
     class main