[][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
diff --git a/feed/regs/Makefile b/feed/regs/Makefile
index d0f2444..239b60c 100755
--- a/feed/regs/Makefile
+++ b/feed/regs/Makefile
@@ -1,7 +1,5 @@
 #
-# hua.shao@mediatek.com
-#
-# MTK Property Software.
+# SPDX-License-Identifier: GPL-2.0
 #
 
 include $(TOPDIR)/rules.mk