health: Add libhealth_aidl_impl_user.

This is the defaults for users of libhealth_aidl_impl.

Test: builds
Bug: 213273090
Change-Id: Iddcc0a0bc194f337c5e9a632ea2468140804a30a
diff --git a/health/aidl/default/Android.bp b/health/aidl/default/Android.bp
index 8aa7638..8eab997 100644
--- a/health/aidl/default/Android.bp
+++ b/health/aidl/default/Android.bp
@@ -120,6 +120,15 @@
     },
 }
 
+// Users of libhealth_aidl_impl should use this defaults.
+cc_defaults {
+    name: "libhealth_aidl_impl_user",
+    defaults: [
+        "libhealth_aidl_common_defaults",
+        "libhealth_aidl_charger_defaults",
+    ],
+}
+
 // AIDL version of android.hardware.health@2.1-service.
 // Default binder service of the health HAL.
 cc_defaults {
@@ -127,8 +136,7 @@
     relative_install_path: "hw",
     vintf_fragments: ["android.hardware.health-service.example.xml"],
     defaults: [
-        "libhealth_aidl_common_defaults",
-        "libhealth_aidl_charger_defaults",
+        "libhealth_aidl_impl_user",
     ],
     static_libs: [
         "libhealth_aidl_impl",