Security/SELinux: includecheck fix kernel/sysctl.c

fix the following 'make includecheck' warning:

  kernel/sysctl.c: linux/security.h is included more than once.
Signed-off-by: NJaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: NJames Morris <jmorris@namei.org>

kernel/sysctl.c

@@ -49,7 +49,6 @@
 #include <linux/acpi.h>
 #include <linux/reboot.h>
 #include <linux/ftrace.h>
-#include <linux/security.h>
 #include <linux/slow-work.h>
 #include <linux/perf_counter.h>