disk_layout: bump stateful partition size

Some builds are dangerously close to the 2 GiB limitation. For instance,
picking up an Octopus R80-12709.0.0 image shows only 77 MiB free:

  $ df -h dir_1/
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/loop1p1    2.0G  1.9G   77M  97% /mnt/host/source/src/scripts/octopus-R80-12709.0.0/dir_1

This partition size isn't magical either, since we're currently well
below the 8 GiB requirement (e.g., for USB disks) but still above 4 GiB:

  $ /sbin/fdisk -l chromiumos_test_image.bin
  Disk chromiumos_test_image.bin: 4.5 GiB, 4861278720 bytes, 9494685 sectors
  Units: sectors of 1 * 512 = 512 bytes
  [...]

And finally, disk images are sparse, so bumping this limit shouldn't
cause any additional disk usage until we actually add packages that use
the space.

3 GiB is an arbitrary increase from 2 GiB that happens to be easy to
type.

BUG=none
TEST=`./build_image [...] test`

Change-Id: Iba40692757a4fa5dab5274269ef7b1e98bd91981
Exempt-From-Owner-Approval: Often breaks CQ
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1935408
Commit-Queue: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
(cherry picked from commit 7c764adc92a5aa3c300fda3786d370f130475c47)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2076030
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Commit-Queue: George Engelbrecht <engeg@google.com>
Tested-by: George Engelbrecht <engeg@google.com>
diff --git a/build_library/disk_layout_v2.json b/build_library/disk_layout_v2.json
index 061c121..d21f45d 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": "3 GiB",
         "features": ["expand"],
         "uuid": "random"
       }
diff --git a/build_library/legacy_disk_layout.json b/build_library/legacy_disk_layout.json
index 1eed64d..83394c3 100644
--- a/build_library/legacy_disk_layout.json
+++ b/build_library/legacy_disk_layout.json
@@ -135,7 +135,7 @@
         "label": "STATE",
         "type": "data",
         "fs_format": "ext4",
-        "size": "2 GiB",
+        "size": "3 GiB",
         "features": ["expand"],
         "uuid": "random"
       }