[AVR32] Add missing #include <linux/module.h>

arch/avr32/kernel/cpu.c needs THIS_MODULE, so it must include
linux/module.h.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/kernel/cpu.c

@@ -9,6 +9,7 @@
 #include <linux/sysdev.h>
 #include <linux/seq_file.h>
 #include <linux/cpu.h>
+#include <linux/module.h>
 #include <linux/percpu.h>
 #include <linux/param.h>
 #include <linux/errno.h>