[][application][change some makefile to SPDX-License-Identifier]

[Description]
Add SPDX License-Identifier

[Release-log]
N/A


Change-Id: I61f72c97e4deebc017f267792255906a3717d853
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6790779
3 files changed