Change ROOT-B from 1 block to 4096 blocks

This fixes alignment on recovery/USB images for install

BUG=chromium-os:38100
TEST=Build image, check partitions to be installed are 2MB aligned

Change-Id: Ie17c15c8850f32f69ee768bd1cad5603e9fe6c69
Previous-Reviewed-on: https://gerrit.chromium.org/gerrit/43865
(cherry picked from commit 25bf6497f11c0b2509c6fec9588e3ecc69cbf054)
Reviewed-on: https://gerrit.chromium.org/gerrit/44347
Commit-Queue: Haixia Shi <hshi@chromium.org>
Reviewed-by: Haixia Shi <hshi@chromium.org>
Tested-by: Haixia Shi <hshi@chromium.org>
1 file changed