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 <paul.gortmaker@windriver.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/bgrt.c

 /*
+ * BGRT boot graphic support
+ * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
  * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
  * Copyright 2012 Intel Corporation
  *
@@ -8,7 +10,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
@@ -103,9 +104,4 @@ static int __init bgrt_init(void)
 	kobject_put(bgrt_kobj);
 	return ret;
 }
-
-module_init(bgrt_init);
-
-MODULE_AUTHOR("Matthew Garrett, Josh Triplett <josh@joshtriplett.org>");
-MODULE_DESCRIPTION("BGRT boot graphic support");
-MODULE_LICENSE("GPL");
+device_initcall(bgrt_init);