vts_fs_test: Statically link libfs_mgr.

Bug: 222065493
Test: builds
Change-Id: I9ce4aa2594a4e946c79a51f0ed3d2121c7eaee36
diff --git a/fs_mgr/tests/Android.bp b/fs_mgr/tests/Android.bp
index 7e3924a..4661312 100644
--- a/fs_mgr/tests/Android.bp
+++ b/fs_mgr/tests/Android.bp
@@ -109,9 +109,9 @@
     ],
     shared_libs: [
         "libbase",
-        "libfs_mgr",
     ],
     static_libs: [
+        "libfs_mgr",
         "libfstab",
         "libgmock",
         "libgtest",