[openwrt/openwrt] kernel: update deprecated license information

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-23.05:
https://git.openwrt.org/6f72d62a5316eed4688645930fab822c6b19c91c

commit 6f72d62a5316eed4688645930fab822c6b19c91c
Author: Florian Eckert <fe at dev.tdt.de>
AuthorDate: Thu Mar 21 12:55:01 2024 +0100

    kernel: update deprecated license information
    
    Update the deprecated license information from GPL-2.0 to GPL-2.0-only
    as written in the COPYING file of the linux source tree.
    
    Also add the 'COPYING' file to the PKG_LICENSE_FILES variable.
    
    Signed-off-by: Florian Eckert <fe at dev.tdt.de>
    (cherry picked from commit 879826154fd3e5ec353117a9c00cecf5e38c4a16)
    Link: https://github.com/openwrt/openwrt/pull/15918
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 package/kernel/linux/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/kernel/linux/Makefile b/package/kernel/linux/Makefile
index ff91760270..b9f547ed61 100644
--- a/package/kernel/linux/Makefile
+++ b/package/kernel/linux/Makefile
@@ -16,8 +16,8 @@ SUBTARGETS = $(sort $(filter-out feeds,$(notdir $(wildcard $(TOPDIR)/target/linu
 SUBTARGET_MODULES = $(foreach t,$(SUBTARGETS),$(firstword $(wildcard $(TOPDIR)/target/linux/feeds/$(t)/modules.mk $(TOPDIR)/target/linux/$(t)/modules.mk)))
 SCAN_DEPS=modules/*.mk $(SUBTARGET_MODULES) $(TOPDIR)/include/netfilter.mk
 
-PKG_LICENSE:=GPL-2.0
-PKG_LICENSE_FILES:=
+PKG_LICENSE:=GPL-2.0-only
+PKG_LICENSE_FILES:=COPYING
 
 export SHELL:=/bin/sh
 .ONESHELL: