pinctrl: pxa: pxa2xx: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE

This change resolves a new compile-time warning
when built as a loadable module:

WARNING: modpost: missing MODULE_LICENSE() in drivers/pinctrl/pxa/pinctrl-pxa2xx.o
see include/linux/module.h for more information

This adds the license as "GPL v2", which matches the header of the file.

MODULE_DESCRIPTION and MODULE_AUTHOR are also added.

Signed-off-by: Jesse Chan <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pxa/pinctrl-pxa2xx.c

···
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_exit);
+
+MODULE_AUTHOR("Robert Jarzmik <[e-mail]>");
+MODULE_DESCRIPTION("Marvell PXA2xx pinctrl driver");
+MODULE_LICENSE("GPL v2");