[PATCH] ramips: add license to TP-Link MR6400 v4's DTS

[Filip Moc]

Signed-off-by: Filip Moc <lede at moc6.cz>
---

Notes:
    Suggested by Adrian Schmutzler:
    
    https://patchwork.ozlabs.org/comment/2584839

 target/linux/ramips/dts/mt7628an_tplink_tl-mr6400-v4.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/linux/ramips/dts/mt7628an_tplink_tl-mr6400-v4.dts b/target/linux/ramips/dts/mt7628an_tplink_tl-mr6400-v4.dts
index f0b87b5312..787abfad55 100644
--- a/target/linux/ramips/dts/mt7628an_tplink_tl-mr6400-v4.dts
+++ b/target/linux/ramips/dts/mt7628an_tplink_tl-mr6400-v4.dts
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
 #include "mt7628an_tplink_8m.dtsi"
 
 / {
-- 
2.28.0