Enable lmkd kill tracing everywhere

Test: asdf
Exempt-From-Owner-Approval: vacation
Change-Id: If6af7df74d303466aac4a69cdfe558e9748f72b9

lmkd/Android.bp

@@ -10,17 +10,8 @@ cc_binary {
         "libstatslogc",
     ],
     local_include_dirs: ["include"],
-    cflags: ["-Werror"],
-
+    cflags: ["-Werror", "-DLMKD_TRACE_KILLS"],
     init_rc: ["lmkd.rc"],
-
-    product_variables: {
-        debuggable: {
-            cflags: [
-                "-DLMKD_TRACE_KILLS"
-            ],
-        },
-    },
 }
 
 cc_library_static {

lmkd/lmkd.c

@@ -55,8 +55,8 @@
 
 #else /* LMKD_TRACE_KILLS */
 
-#define TRACE_KILL_START(pid)
-#define TRACE_KILL_END()
+#define TRACE_KILL_START(pid) ((void)(pid))
+#define TRACE_KILL_END() ((void)0)
 
 #endif /* LMKD_TRACE_KILLS */