By default, we generate SWU files which update both the linux and rootfs
partitions. This, along with the fact that platforms using NAND as the storage
media require a reboot for the rootfs partition's "enc" flag to take effect,
makes it safe to format the NAND's rootfs partition before performing an
update, regardless of having to encrypt the rootfs or not.
However, customers that wish to use the swupdate feature to update just the
linux partition will find that the rootfs is completely erased after the update
is finished, because a new rootfs hasn't been written in its place.
To avoid this scenario, parse the SWU package's description to verify that it
contains a rootfs image before formatting the partition.
https://jira.digi.com/browse/DEL-7067
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
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