kernel: ksysfs.c is implicitly using stat.h

With the module.h usage cleanup, we'll get this:

kernel/ksysfs.c:161: error: ‘S_IRUGO’ undeclared here (not in a function)
make[2]: *** [kernel/ksysfs.o] Error 1
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

kernel/ksysfs.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/kexec.h>
 #include <linux/profile.h>
+#include <linux/stat.h>
 #include <linux/sched.h>
 #include <linux/capability.h>