octeon: enable 6.18 testing kernel

Enable the 6.18 testing kernel for Octeon.

Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
Link: openwrt/openwrt#23031
Signed-off-by: Nick Hainke <vincent@systemli.org>

Author: andrewjlamarche

target/linux/octeon/Makefile

@@ -11,6 +11,7 @@ FEATURES:=squashfs ramdisk pci usb
 CPU_TYPE:=octeonplus
 
 KERNEL_PATCHVER:=6.12
+KERNEL_TESTING_PATCHVER:=6.18
 
 define Target/Description
 	Build firmware images for Cavium Networks Octeon-based boards.