target: make TESTING_KERNEL selectable

config/Config-build.in

@@ -47,6 +47,14 @@ menu "Global build settings"
 
 	comment "General build options"
 
+	config TESTING_KERNEL
+		bool "Use the testing kernel version"
+		depends on HAS_TESTING_KERNEL
+		default n
+		help
+		  If the target supports a newer kernel version than the default,
+		  you can use this config option to enable it
+
 	config DISPLAY_SUPPORT
 		bool "Show packages that require graphics support (local or remote)"
 		default n

target/Config.in

@@ -2,6 +2,9 @@ source "tmp/.config-target.in"
 
 # Kernel/Hardware features
 
+config HAS_TESTING_KERNEL
+	bool
+
 config HAS_SPE_FPU
 	depends on powerpc
 	select HAS_FPU