Convert healthd_test to Soong

This makefile is not included before, so it was never built. Also do
the following changes to make sure it works:

- Remove non-existing libhealthd_internal dep
- Add necessary libhealthd_charger dep because it tests AnimationParser
- Since it tests AnimationParser, change its name to
libhealthd_charger_test

Test: run it

Change-Id: If7f91de4b910024f27d09a25ca801e67b98221db
diff --git a/healthd/Android.bp b/healthd/Android.bp
index 14d46b3..3a7ab75 100644
--- a/healthd/Android.bp
+++ b/healthd/Android.bp
@@ -240,3 +240,16 @@
     defaults: ["charger_defaults"],
     srcs: ["charger_test.cpp"],
 }
+
+cc_test {
+    name: "libhealthd_charger_test",
+    srcs: ["AnimationParser_test.cpp"],
+    shared_libs: [
+        "liblog",
+        "libbase",
+        "libcutils",
+    ],
+    static_libs: [
+        "libhealthd_charger",
+    ],
+}