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

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/5429411f732ba76eced30b5b596ec9c0374d0965

commit 5429411f732ba76eced30b5b596ec9c0374d0965
Author: Stijn Segers <foss at volatilesystems.org>
AuthorDate: Fri Dec 2 13:36:20 2022 +0100

    mvebu: switch default kernel to 5.15
    
    In light of https://github.com/openwrt/openwrt/issues/11077, switch mvebu
    to 5.15 which has been the testing kernel on this target since April - over
    half a year.
    
    Run-tested on the following subtargets:
    * cortexa9 (Turris Omnia - 03f41b1eb2f15ab06d5800274be6a67c64e2a629)
    * cortexa72 (MikroTik RB5009UG+S+IN)
    
    Tested-by: Enrico Mioso <mrkiko.rs at gmail.com> [GL-MV1000]
    Signed-off-by: Stijn Segers <foss at volatilesystems.org>
---
 target/linux/mvebu/Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/target/linux/mvebu/Makefile b/target/linux/mvebu/Makefile
index 6a1e0f63f7..2971f3fcaf 100644
--- a/target/linux/mvebu/Makefile
+++ b/target/linux/mvebu/Makefile
@@ -9,8 +9,7 @@ BOARDNAME:=Marvell EBU Armada
 FEATURES:=fpu usb pci pcie gpio nand squashfs ramdisk boot-part rootfs-part legacy-sdcard targz
 SUBTARGETS:=cortexa9 cortexa53 cortexa72
 
-KERNEL_PATCHVER:=5.10
-KERNEL_TESTING_PATCHVER:=5.15
+KERNEL_PATCHVER:=5.15
 
 include $(INCLUDE_DIR)/target.mk