Fix build error

Add dependency to libbatteryservice_headers as this module is using a
header from the headers lib.

Change-Id: Idc9e1da38791981523667dfff9c3c96c1932ee8d
diff --git a/Android.mk b/Android.mk
index 776680b..b50e33b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -11,4 +11,6 @@
     bootable/recovery \
     bootable/recovery/minui/include
 
+LOCAL_HEADER_LIBRARIES := libbatteryservice_headers
+
 include $(BUILD_STATIC_LIBRARY)