nativepowerman: add "wakelock" GID for wakelock sysfs access

nativepowerman must now run under group AID_WAKELOCK to access the sysfs
wakelock interface.

Bug: 26348967
Bug: 25864142
Change-Id: I1603b5a91c450b32d7d7ff9a6662fcdc1f6b4fed
diff --git a/daemon/Android.mk b/daemon/Android.mk
index 3bfd722..170361c 100644
--- a/daemon/Android.mk
+++ b/daemon/Android.mk
@@ -62,7 +62,7 @@
 include $(BUILD_SYSTEM)/base_rules.mk
 
 $(LOCAL_BUILT_MODULE): $(INITRC_TEMPLATE)
-	$(call generate-initrc-file,nativepowerman,,)
+	$(call generate-initrc-file,nativepowerman,,wakelock)
 endif
 
 # libnativepowerman client library (for daemon and tests)