The EFI System Partition is a special disk partition where EFI BIOS expects
to find the platform-specific bootloader. We need this in order to work on
the BIOS/kernel handoff. It's not needed for the final ChromeOS image and it
isn't useful for legacy BIOS systems, so right now it only makes any difference on x86
devices with development BIOSes.
This change creates the partition for ARM builds as well; it has no effect
there, either.
Review URL: http://codereview.chromium.org/1513019
Fully automated test that uses vmplayer to test updating from
dev-channel -> image-under-test -> rollback to dev-channel.
Also, change to vmware image generation so that vmware images are
generated with two 1-GiB sized root partitions
Review URL: http://codereview.chromium.org/1512001
