[openwrt/openwrt] mediatek: add SPDX header for Confiabits MT7981 DTS

[LEDE Commits]

rmilecki pushed a commit to openwrt/openwrt.git, branch openwrt-23.05:
https://git.openwrt.org/fd6831731b9bde3847c7d8fd8dae528d863017dd

commit fd6831731b9bde3847c7d8fd8dae528d863017dd
Author: Luis Mita <luis at luismita.com>
AuthorDate: Wed Dec 6 09:30:10 2023 -0400

    mediatek: add SPDX header for Confiabits MT7981 DTS
    
    Fixing ambiguous licensing.
    
    Signed-off-by: Luis Mita <luis at luismita.com>
    (cherry picked from commit b1fd4b35bf784a9b5619e17c07389e79af113953)
---
 target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts b/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts
index 2824bbfc84..520b8494ee 100644
--- a/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts
+++ b/target/linux/mediatek/dts/mt7981b-confiabits-mt7981.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
 /dts-v1/;
 
 #include "mt7981.dtsi"