[][SBC][MT7988][Fix sysupgrade-tar failed to tar rootfs]

[Description]
Fix sysupgrade-tar failed to tar rootfs, synchronize the change 7242660,
append hashed rootfs name from root.squashfs+pkg=xxx-hashed to
root.squashfs+pkg=xxx-hashed-$(DEVICE_NAME) to sysupgrade-tar correct
rootfs file

[Release-log]
N/A

Change-Id: I9d1905794bf451e663a40f63bb1237defc468c2e
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7264315
1 file changed