It was observed that `rootfs_data` was sometimes not correctly erased
after performing sysupgrade, resulting in previous settings to prevail.
Add call to `wrgg-pad-rootfs` in sysupgrade image recipe to ensure any
previous jffs2 will be wiped, consistent with DAP-2610 from the ipq40xx
target, which introduced the double-flashing procedure for these devices.
Signed-off-by: Sebastian Schaper <openwrt@sebastianschaper.net>
f770c33d7b