ACPI / PMIC: remove modular references from non-modular code

The Kconfig currently controlling compilation of these files are:

drivers/acpi/Kconfig:menuconfig PMIC_OPREGION
drivers/acpi/Kconfig: bool "PMIC (Power Management Integrated Circuit) operation region support"

drivers/acpi/Kconfig:config BXT_WC_PMIC_OPREGION
drivers/acpi/Kconfig: bool "ACPI operation region support for BXT WhiskeyCove PMIC"

drivers/acpi/Kconfig:config XPOWER_PMIC_OPREGION
drivers/acpi/Kconfig: bool "ACPI operation region support for XPower AXP288 PMIC"

...meaning they currently are not being built as a module by anyone.

Lets remove the couple traces of modular infrastructure use, so that
when reading the code there is no doubt it is builtin-only.

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

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

In one case we replace the module.h with export.h since that file
is exporting some symbols, but does not use __init. The other two
are using __init and so module.h gets replaced with init.h there.

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

drivers/acpi/pmic/intel_pmic.c

···
  * GNU General Public License for more details.
  */
 
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/acpi.h>
 #include <linux/regmap.h>
 #include <acpi/acpi_lpat.h>
···
 	return ret;
 }
 EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
-
-MODULE_LICENSE("GPL");

drivers/acpi/pmic/intel_pmic_bxtwc.c

···
  * GNU General Public License for more details.
  */
 
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/mfd/intel_soc_pmic.h>
 #include <linux/regmap.h>
···
 {
 	return platform_driver_register(&intel_bxtwc_pmic_opregion_driver);
 }
-
 device_initcall(intel_bxtwc_pmic_opregion_driver_init);
-
-MODULE_DESCRIPTION("BXT WhiskeyCove ACPI opregion driver");
-MODULE_LICENSE("GPL");

drivers/acpi/pmic/intel_pmic_xpower.c

···
  * GNU General Public License for more details.
  */
 
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/mfd/axp20x.h>
 #include <linux/regmap.h>
···
 {
 	return platform_driver_register(&intel_xpower_pmic_opregion_driver);
 }
-module_init(intel_xpower_pmic_opregion_driver_init);
-
-MODULE_DESCRIPTION("XPower AXP288 ACPI operation region driver");
-MODULE_LICENSE("GPL");
+device_initcall(intel_xpower_pmic_opregion_driver_init);