leds: ledtrig-cpu: Make the driver explicitly non-modular

The Kconfig for this driver is currently:

config LEDS_TRIGGER_CPU
bool "LED CPU Trigger"

...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Cc: Bryan Wu <[e-mail]>
Cc: Richard Purdie <[e-mail]>
Cc: [e-mail]
Signed-off-by: Paul Gortmaker <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Signed-off-by: Jacek Anaszewski <[e-mail]>

drivers/leds/trigger/ledtrig-cpu.c

···
  *
  */
 
-#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/slab.h>
···
 
 	return 0;
 }
-module_init(ledtrig_cpu_init);
-
-static void __exit ledtrig_cpu_exit(void)
-{
-	int cpu;
-
-	unregister_cpu_notifier(&ledtrig_cpu_nb);
-
-	for_each_possible_cpu(cpu) {
-		struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);
-
-		led_trigger_unregister_simple(trig->_trig);
-		trig->_trig = NULL;
-		memset(trig->name, 0, MAX_NAME_LEN);
-	}
-
-	unregister_syscore_ops(&ledtrig_cpu_syscore_ops);
-}
-module_exit(ledtrig_cpu_exit);
-
-MODULE_AUTHOR("Linus Walleij <[e-mail]>");
-MODULE_AUTHOR("Bryan Wu <[e-mail]>");
-MODULE_DESCRIPTION("CPU LED trigger");
-MODULE_LICENSE("GPL");
+device_initcall(ledtrig_cpu_init);