Set e2freefrag and e2fsdroid as required by libfs_mgr_defaults

libfs_mgr_defaults uses the e2fsdroid binary, make this dependency
explicit.
Add also e2freefrag as a dependency in preparation for filesystem
fragmentation monitoring.

Bug: 146078546
Test: m + e2freefrag on device
Change-Id: I878d1b090809861c803f6b17fbb3813e03842a50
Signed-off-by: Alessio Balsini <balsini@google.com>
diff --git a/fs_mgr/Android.bp b/fs_mgr/Android.bp
index 34c64d2..7f432d0 100644
--- a/fs_mgr/Android.bp
+++ b/fs_mgr/Android.bp
@@ -95,6 +95,10 @@
     export_header_lib_headers: [
         "libfiemap_headers",
     ],
+    required: [
+        "e2freefrag",
+        "e2fsdroid",
+    ],
 }
 
 // Two variants of libfs_mgr are provided: libfs_mgr and libfs_mgr_binder.