[][Add tool to support embed dm-verity bootargs into fdt]

[Description]
Add tool to support embed dm-verity bootargs into fdt

[Release-log]
N/A

Change-Id: I65ef262484ecc48efc513b0ef1a0cb96e5440011
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5850557
18 files changed