pinctrl: imx51: make it explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/pinctrl/freescale/Kconfig:config PINCTRL_IMX51
drivers/pinctrl/freescale/Kconfig:	bool "IMX51 pinctrl driver"

...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 was not in use by this driver, 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: Linus Walleij <linus.walleij@linaro.org>
Cc: Dong Aisheng <dong.aisheng@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-imx51.c

@@ -15,7 +15,6 @@
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
-#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/pinctrl/pinctrl.h>
@@ -791,12 +790,3 @@ static int __init imx51_pinctrl_init(void)
 	return platform_driver_register(&imx51_pinctrl_driver);
 }
 arch_initcall(imx51_pinctrl_init);
-
-static void __exit imx51_pinctrl_exit(void)
-{
-	platform_driver_unregister(&imx51_pinctrl_driver);
-}
-module_exit(imx51_pinctrl_exit);
-MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
-MODULE_DESCRIPTION("Freescale IMX51 pinctrl driver");
-MODULE_LICENSE("GPL v2");