Remove all inclusions of <linux/config.h>

kbuild explicitly includes this at build time.

Signed-off-by: Dave Jones <davej@redhat.com>

arch/um/drivers/slip_kern.c

@@ -1,4 +1,3 @@
-#include "linux/config.h"
 #include "linux/kernel.h"
 #include "linux/stddef.h"
 #include "linux/init.h"