[source] ar71xx: use kernel 4.9 by default

[LEDE Commits]

hauke pushed a commit to source.git, branch master:
https://git.lede-project.org/c84b7eaedd1b3c9b7e3e30248ab3d0050477f6d5

commit c84b7eaedd1b3c9b7e3e30248ab3d0050477f6d5
Author: Hauke Mehrtens <hauke at hauke-m.de>
AuthorDate: Sun Oct 22 15:20:39 2017 +0200

    ar71xx: use kernel 4.9 by default
    
    Kernel 4.9 support was added about 2 weeks ago and we haven't seen any
    major regression so far. This patch was not ported to kernel 4.9, this
    needs some additional work:
    821-serial-core-add-support-for-boot-console-with-arbitr.patch
    
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/ar71xx/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/ar71xx/Makefile b/target/linux/ar71xx/Makefile
index 3f5bc67..6d5b4c5 100644
--- a/target/linux/ar71xx/Makefile
+++ b/target/linux/ar71xx/Makefile
@@ -13,7 +13,7 @@ FEATURES:=usbgadget
 CPU_TYPE:=24kc
 SUBTARGETS:=generic nand mikrotik
 
-KERNEL_PATCHVER:=4.4
+KERNEL_PATCHVER:=4.9
 
 include $(INCLUDE_DIR)/target.mk