x86/headers: Include spinlock_types.h in x8664_ksyms_64.c for missing spinlock_t

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-next@vger.kernel.org
Fixes: 186f43608a5c ("x86/kernel: Audit and remove any unnecessary uses of module.h")
Link: http://lkml.kernel.org/r/20160718182922.7b41f923@canb.auug.org.au
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/x8664_ksyms_64.c

@@ -2,6 +2,7 @@
    All C exports should go in the respective C files. */
 
 #include <linux/export.h>
+#include <linux/spinlock_types.h>
 #include <linux/smp.h>
 
 #include <net/checksum.h>