init: Format userdata_gsi if needed.

Bug: 122850122
Test: manual test
Change-Id: I581578720816cae19fe9352967508fc1a7606f42
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 9d4f280..8076909 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -686,6 +686,7 @@
     userdata.fs_mgr_flags.logical = true;
     userdata.fs_mgr_flags.quota = true;
     userdata.fs_mgr_flags.late_mount = true;
+    userdata.fs_mgr_flags.formattable = true;
     fstab->emplace_back(userdata);
 }