Add the metalava_enabled property

The new property is added for supporting metalava. But some sdk library
cannot use metalava. So "metalava_enabled: false" is added to these
modules.

Test: make -j
Test: checkapi
Bug: 117127012
Change-Id: Ib65f3cd73dac0ac6ed64afeca6546d99739e4424
diff --git a/test-base/Android.bp b/test-base/Android.bp
index 0b8a02a..4d765d3 100644
--- a/test-base/Android.bp
+++ b/test-base/Android.bp
@@ -37,7 +37,8 @@
         "junit.framework",
     ],
 
-    droiddoc_options: ["stubsourceonly"],
+    droiddoc_options: ["-stubsourceonly"],
+    metalava_enabled: false,
     compile_dex: true,
 }