octeon: use kernel version 5.4 for testing

Tested on EdgeRouter Lite (by Daniel Engberg)

Signed-off-by: Adrian Schmutzler <[email protected]>

target/linux/octeon/Makefile

@@ -13,6 +13,7 @@ FEATURES:=squashfs ramdisk pci usb
 CPU_TYPE:=octeonplus
 
 KERNEL_PATCHVER:=4.19
+KERNEL_TESTING_PATCHVER:=5.4
 
 define Target/Description
 	Build firmware images for Cavium Networks Octeon-based boards.