charger: vendor charger use resources from /vendor

For the vendor variant of libhealthd_mode_charger, read resources
from /vendor. The core variant continues to read resources from
/product, /system, and /res.

Test: run charger from /vendor manually
Bug: 203246116
Change-Id: Ia9df1d081a51783409b5dbd3e3d4719efc3cb6a7
diff --git a/healthd/Android.bp b/healthd/Android.bp
index be3f920..eaa8e5b 100644
--- a/healthd/Android.bp
+++ b/healthd/Android.bp
@@ -325,3 +325,29 @@
         "system_core_charger_res_images_battery_scale.png",
     ],
 }
+
+// /vendor/etc/res/images/charger/battery_fail.png
+prebuilt_etc {
+    name: "system_core_charger_res_images_battery_fail.png_default_vendor",
+    src: "images/battery_fail.png",
+    relative_install_path: "res/images/charger/default",
+    vendor: true,
+    filename: "battery_fail.png",
+}
+
+// /vendor/etc/res/images/charger/battery_scale.png
+prebuilt_etc {
+    name: "system_core_charger_res_images_battery_scale.png_default_vendor",
+    src: "images/battery_scale.png",
+    relative_install_path: "res/images/charger/default",
+    vendor: true,
+    filename: "battery_scale.png",
+}
+
+phony {
+    name: "charger_res_images_vendor",
+    required: [
+        "system_core_charger_res_images_battery_fail.png_default_vendor",
+        "system_core_charger_res_images_battery_scale.png_default_vendor",
+    ],
+}