kernel: add missing symbol

Enabling KERNEL_KPROBES exposes KERNEL_BPF_KPROBE_OVERRIDE. Add a build
option for it to fix build failures with KERNEL_KPROBES enabled.

Signed-off-by: Stijn Tintel <[email protected]>

config/Config-kernel.in

@@ -422,6 +422,11 @@ config KERNEL_KPROBE_EVENTS
 	bool
 	default y if KERNEL_KPROBES
 
+config KERNEL_BPF_KPROBE_OVERRIDE
+	bool
+	depends on KERNEL_KPROBES
+	default n
+
 config KERNEL_AIO
 	bool "Compile the kernel with asynchronous IO support"
 	default y if !SMALL_FLASH