Install kernels on partition 12 on arm
Install kernels on partition 12 on arm

This is needed on some ARM boards where ext2 filesystem reading isn't an option,
and where verified boot isn't in use, i.e. with legacy firmware. x86 stores the
kernel here as well.

BUG=none
TEST=build_image on an arm board and check contents for vmlinuz.A and vmlinuz.uimg.A on
partition 12

Change-Id: I89b652cb6ea7ece1627b20be30492100f8db0770
Signed-off-by: Olof Johansson <13dc431ca3b0f062f888def8f8ec4662ec608f7d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/13441

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