disk_layout_v2: Increase the default stateful size from 2GB to 4GB

BUG=None
TEST=Build CrOS images

Change-Id: I5a0f640225c988cd5ebb07dc18acccb8e491529d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2038512
Tested-by: Woody Chow <woodychow@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Lepton Wu <lepton@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/build_library/disk_layout_v2.json b/build_library/disk_layout_v2.json
index 061c121..c8edbad 100644
--- a/build_library/disk_layout_v2.json
+++ b/build_library/disk_layout_v2.json
@@ -111,7 +111,7 @@
         "label": "STATE",
         "type": "data",
         "fs_format": "ext4",
-        "size": "2 GiB",
+        "size": "4 GiB",
         "features": ["expand"],
         "uuid": "random"
       }