[][MT7988][Fix dm-verity failed due to non-hashed rootfs in factory.bin]

[Description]
Change non-hashed rootfs to hashed rootfs to generate factory.bin

[Release-log]
N/A

Change-Id: I52763717cb11082c7fc99d8b40cd9f39a83ea161
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7428048
1 file changed