Remove usages of java_api_finder

This errorprone checker is no longer used.

Bug: 260268418
Test: Presubmits
Change-Id: I85c1fcbc7bec24db85b8a460d729f1f367311ef3
diff --git a/javalib/Android.bp b/javalib/Android.bp
index 8421231..71287f2 100644
--- a/javalib/Android.bp
+++ b/javalib/Android.bp
@@ -38,9 +38,6 @@
         javacflags: [
             // We use @GuardedBy and we want a test failure if our locking isn't consistent with it.
             "-Xep:GuardedBy:ERROR",
-            // JavaApiUsedByMainlineModule is quite spammy, and since we com.android.virt is not
-            // an updatable module we don't need it.
-            "-Xep:JavaApiUsedByMainlineModule:OFF",
         ],
     },