add support for kernel module unloading

Signed-off-by: Mario Haustein <mario.haustein@hrz.tu-chemnitz.de>

target/linux/config/Config.in.kernel

@@ -58,6 +58,9 @@ config ADK_KERNEL_CPU_LITTLE_ENDIAN
 
 menu "Kernel options"
 
+config ADK_KERNEL_MODULE_UNLOAD
+	bool "Module unloading"
+
 config ADK_KERNEL_HOTPLUG
 	bool