lkdtm: include cacheflush.h

Some architectures need cacheflush.h explicitly included (mips) for
use of flush_icache_range():

    config: make ARCH=mips allmodconfig
    All error/warnings:
    >> ERROR: "flush_icache_range" undefined!

Reported-by: Fengguang Wu <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: kees

drivers/misc/lkdtm.c

@@ -46,6 +46,7 @@
 #include <linux/debugfs.h>
 #include <linux/vmalloc.h>
 #include <linux/mman.h>
+#include <asm/cacheflush.h>
 
 #ifdef CONFIG_IDE
 #include <linux/ide.h>