Support both flashing the images and saving them to disk
On many boards there is only enough MTD space for flashing a single kernel/initrd image pair. If something happens while flashing a new image, the system is left in an unbootable state.
The Mtd-Kernel
and Boot-Kernel-Path
options are currently mutualy
exclusive. This commit allows for both of these options to be honoured
if set. This is especially useful when used in conjunction with the
Boot-Kernel-Path-Version
option.