pinctrl: imx21: make it explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/pinctrl/freescale/Kconfig:config PINCTRL_IMX21
drivers/pinctrl/freescale/Kconfig:	bool "i.MX21 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_platform_driver() uses the same init level priority as
builtin_platform_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: Alexander Shiyan <shc_work@mail.ru>
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-imx21.c

@@ -9,7 +9,7 @@
  * (at your option) any later version.
  */
 
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pinctrl/pinctrl.h>
@@ -333,8 +333,4 @@ static struct platform_driver imx21_pinctrl_driver = {
 		.of_match_table	= imx21_pinctrl_of_match,
 	},
 };
-module_platform_driver_probe(imx21_pinctrl_driver, imx21_pinctrl_probe);
-
-MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
-MODULE_DESCRIPTION("Freescale i.MX21 pinctrl driver");
-MODULE_LICENSE("GPL");
+builtin_platform_driver_probe(imx21_pinctrl_driver, imx21_pinctrl_probe);