[openwrt/openwrt] lantiq: Add Linux 5.15 as testing kernel version

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/d4571e98ab0ed444c02bcdb25128109b73da5f6c

commit d4571e98ab0ed444c02bcdb25128109b73da5f6c
Author: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
AuthorDate: Mon Mar 21 20:31:23 2022 +0100

    lantiq: Add Linux 5.15 as testing kernel version
    
    Signed-off-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
---
 target/linux/lantiq/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/lantiq/Makefile b/target/linux/lantiq/Makefile
index 89f457ec5f..08618fa9a3 100644
--- a/target/linux/lantiq/Makefile
+++ b/target/linux/lantiq/Makefile
@@ -10,7 +10,7 @@ FEATURES:=squashfs
 SUBTARGETS:=xrx200 xway xway_legacy falcon ase
 
 KERNEL_PATCHVER:=5.10
-KERNEL_TESTING_PATCHVER:=5.10
+KERNEL_TESTING_PATCHVER:=5.15
 
 define Target/Description
 	Build firmware images for Lantiq SoC