drivers/acpi: make bgrt driver explicitly non-modular

The Kconfig for this driver is currently:

config ACPI_BGRT
bool "Boottime Graphics Resource Table support"

...meaning that it currently is not being built as a module by anyone.
Lets remove all modular references, 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
was (or is now) contained at the top of the file in the comments.

Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/bgrt.c

···
 /*
+ * BGRT boot graphic support
+ * Authors: Matthew Garrett, Josh Triplett <[e-mail]>
  * Copyright 2012 Red Hat, Inc <[e-mail]>
  * Copyright 2012 Intel Corporation
  *
···
  */
 
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
···
 	kobject_put(bgrt_kobj);
 	return ret;
 }
-
-module_init(bgrt_init);
-
-MODULE_AUTHOR("Matthew Garrett, Josh Triplett <[e-mail]>");
-MODULE_DESCRIPTION("BGRT boot graphic support");
-MODULE_LICENSE("GPL");
+device_initcall(bgrt_init);