Make sure car-lib system APIs are not changing unintentionally

Soon had a special rule to skip the "released-api" compatibility
check on the car-lib system API. We should enable it.

Bug: 154632388
Test: m droid
Change-Id: Ib4e584def7e786e3e129cd2bfb23958ac9b4b72d
diff --git a/java/androidmk.go b/java/androidmk.go
index 3a6b97a..d8a3884 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -577,14 +577,12 @@
 					fmt.Fprintln(w, dstubs.Name()+"-check-last-released-api:",
 						dstubs.checkLastReleasedApiTimestamp.String())
 
-					if dstubs.Name() != "android.car-system-stubs-docs" {
-						fmt.Fprintln(w, ".PHONY: checkapi")
-						fmt.Fprintln(w, "checkapi:",
-							dstubs.checkLastReleasedApiTimestamp.String())
+					fmt.Fprintln(w, ".PHONY: checkapi")
+					fmt.Fprintln(w, "checkapi:",
+						dstubs.checkLastReleasedApiTimestamp.String())
 
-						fmt.Fprintln(w, ".PHONY: droidcore")
-						fmt.Fprintln(w, "droidcore: checkapi")
-					}
+					fmt.Fprintln(w, ".PHONY: droidcore")
+					fmt.Fprintln(w, "droidcore: checkapi")
 				}
 				if dstubs.apiLintTimestamp != nil {
 					fmt.Fprintln(w, ".PHONY:", dstubs.Name()+"-api-lint")