[openwrt/openwrt] kirkwood: add 6.12 as testing kernel

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/53acaf1f3f458b104792951dc42b7d0cc31370a6

commit 53acaf1f3f458b104792951dc42b7d0cc31370a6
Author: Pawel Dembicki <paweldembicki at gmail.com>
AuthorDate: Sun Jun 8 10:21:48 2025 +0200

    kirkwood: add 6.12 as testing kernel
    
    Support for 6.12 is ready; add it as a testing kernel.
    
    Signed-off-by: Pawel Dembicki <paweldembicki at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/19069
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/kirkwood/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/kirkwood/Makefile b/target/linux/kirkwood/Makefile
index 2010f9a812..04d58c59e0 100644
--- a/target/linux/kirkwood/Makefile
+++ b/target/linux/kirkwood/Makefile
@@ -12,6 +12,7 @@ CPU_TYPE:=xscale
 SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=6.6
+KERNEL_TESTING_PATCHVER:=6.12
 
 include $(INCLUDE_DIR)/target.mk