[FS#197] Unable to flash new image on mvebu

[LEDE Bugs]

The following task has a new comment added:

FS#197 - Unable to flash new image on mvebu
User who did this - Kabuli Chana (anomeome)

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>From /lib/upgrade/linksys.sh, this
append sysupgrade_pre_upgrade linksys_preupgrade
is required by wrt1x00acx devices
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=197#comment549