[openwrt/openwrt] ath25: switch default kernel to 5.15

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/397ba0b54b22454104e57af98bd95db2fb80c50e

commit 397ba0b54b22454104e57af98bd95db2fb80c50e
Author: Nick Hainke <vincent at systemli.org>
AuthorDate: Fri May 5 14:09:37 2023 +0200

    ath25: switch default kernel to 5.15
    
    Switch to kernel 5.15 although it is marked as source only. It is marked
    as source only because nobody was able to test this device.
    
    Merging this is important to finally branch a new release. We want to
    get rid completely of 5.10 kernel. Without this commit we get following
    error: "Missing kernel version/hash file for 5.10." Hopfully someone
    will fix the board in the rc phase or it will be removed completly.
    
    Signed-off-by: Nick Hainke <vincent at systemli.org>
---
 target/linux/ath25/Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/target/linux/ath25/Makefile b/target/linux/ath25/Makefile
index ea90c803fd..84d22ca361 100644
--- a/target/linux/ath25/Makefile
+++ b/target/linux/ath25/Makefile
@@ -10,8 +10,7 @@ BOARDNAME:=Atheros AR231x/AR5312
 FEATURES:=squashfs low_mem small_flash source-only
 SUBTARGETS:=generic
 
-KERNEL_PATCHVER:=5.10
-KERNEL_TESTING_PATCHVER:=5.15
+KERNEL_PATCHVER:=5.15
 
 define Target/Description
 	Build firmware images for Atheros SoC boards