Reinstate "Update boot image signature format to version 1"

This reverts commit 7377e002421ed9a04cc94cd808c234f48d93924d.

Change-Id: I4b1d83b62ae4d4dd6952663744b1171b3e0d0766
Signed-off-by: Iliyan Malchev <malchev@google.com>
3 files changed