Override apexes with LOCAL_OVERRIDES_MODULES

APEXes are ETC type, which should be overridden via
LOCAL_OVERRIDES_MODULES. This change fixes a bug that
LOCAL_OVERRIDES_PACKAGES was used for APEXes.

Bug: 140792287
Test: m
Test: add com.google.android.tzdata to PRODUCT_PACKAGES and build.
/system/apex/com.google.android.tzdata.apex exists, but
/system/apex/com.android.tzdata.apex doesn't.

Change-Id: Id65743b36e0b706d6ffd8cae0597cc0a42a83fb7
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 614164d..1306aef 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -2251,9 +2251,9 @@
 	p := ctx.ModuleForTests("myapex.prebuilt", "android_common").Module().(*Prebuilt)
 
 	expected := []string{"myapex"}
-	actual := android.AndroidMkEntriesForTest(t, config, "", p).EntryMap["LOCAL_OVERRIDES_PACKAGES"]
+	actual := android.AndroidMkEntriesForTest(t, config, "", p).EntryMap["LOCAL_OVERRIDES_MODULES"]
 	if !reflect.DeepEqual(actual, expected) {
-		t.Errorf("Incorrect LOCAL_OVERRIDES_PACKAGES value '%s', expected '%s'", actual, expected)
+		t.Errorf("Incorrect LOCAL_OVERRIDES_MODULES value '%s', expected '%s'", actual, expected)
 	}
 }