healthd: charger use runtime sysprops instead.

Bug: 124118169
Test: run off-mode charging
Change-Id: Ib71f84f1c93d1566f4e3101920d98b1d39184390
diff --git a/healthd/Android.bp b/healthd/Android.bp
index 2cf6be9..0dcaa67 100644
--- a/healthd/Android.bp
+++ b/healthd/Android.bp
@@ -110,3 +110,10 @@
         "libutils",
     ],
 }
+
+sysprop_library {
+    name: "charger_sysprop",
+    srcs: ["charger.sysprop"],
+    property_owner: "Platform",
+    api_packages: ["android.sysprop"],
+}