Shrink rootfs

- With a 12G size passed to fallocate, we get a filesystem that actually
is longer than our total space according to the partition table, and
booting fails with this message:
[    2.691320] EXT4-fs (mmcblk0p2): bad geometry: block count 3145728 exceeds size of device (3133440 blocks)
- Set to 2G, if more space is needed rezise2fs can be used.

Change-Id: I145cc786d52f9ce7d1458ccf5c2a515649d08723
1 file changed