Only customize AlarmService for ARC++

And not for ARCVM.

Bug: 135558634
Test: Compiled
Change-Id: I45001baddbfdeca4853f86a128d8b71d54b5f8ac
diff --git a/services/core/jni/Android.bp b/services/core/jni/Android.bp
index 6218498..7274d17 100644
--- a/services/core/jni/Android.bp
+++ b/services/core/jni/Android.bp
@@ -62,6 +62,17 @@
         "frameworks/native/services",
         "system/gatekeeper/include",
     ],
+
+    product_variables: {
+        arc: {
+            exclude_srcs: [
+                "com_android_server_AlarmManagerService.cpp",
+            ],
+            srcs: [
+                ":arctimersrcs",
+            ],
+        }
+    }
 }
 
 cc_defaults {