build_image relies on mkuserimg_mke2fs.

Add missing dependency.

Test: TH
Bug: 162921175
Change-Id: Ide1fe0b823e5e7a06c6c0252a5bef7bfaf6f7c28
diff --git a/tools/releasetools/Android.bp b/tools/releasetools/Android.bp
index ace00ac..21134b6 100644
--- a/tools/releasetools/Android.bp
+++ b/tools/releasetools/Android.bp
@@ -49,6 +49,7 @@
     required: [
         "blk_alloc_to_base_fs",
         "e2fsck",
+        "mkuserimg_mke2fs",
         "simg2img",
         "tune2fs",
     ],