631cae1fee
Patch adds support to create PowerPC image with vm element. It creates 2 partitions, one for PReP boot and other for root and installs grub-ieee1275. Change-Id: I4675ef2b82aa69b63e63a1cc7db01b0c0e6f9fff Closes-Bug: 1418739
Sets up a partitioned disk (rather than building just one filesystem with no partition table).
By default the disk will have grub[2]-install run on it. In case GRUB2 is not available in the system, a fallback to Extlinux will happen. It's also possible to enforce the use of Extlinux by exporting a DIB_EXTLINUX variable to the environment.