pinctrl: zynq: use module_platform_driver to simplify the code

module_platform_driver() makes the code simpler by eliminating
boilerplate code.

Signed-off-by: Srinivas Neeli <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-zynq.c

···
  */
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
···
 	.probe = zynq_pinctrl_probe,
 };
 
-static int __init zynq_pinctrl_init(void)
-{
-	return platform_driver_register(&zynq_pinctrl_driver);
-}
-arch_initcall(zynq_pinctrl_init);
+module_platform_driver(zynq_pinctrl_driver);