mfd: sun6i-prcm: Make it explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/mfd/Kconfig:config MFD_SUN6I_PRCM
drivers/mfd/Kconfig: bool "Allwinner A31 PRCM controller"

...meaning that it currently is not being built as a module by anyone.

Lets remove the couple traces of modularity 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.

Signed-off-by: Paul Gortmaker <[e-mail]>
Acked-by: Maxime Ripard <[e-mail]>
Acked-by: Boris Brezillon <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/sun6i-prcm.c

···
  */
 
 #include <linux/mfd/core.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/of.h>
 
 struct prcm_data {
···
 	},
 	.probe = sun6i_prcm_probe,
 };
-module_platform_driver(sun6i_prcm_driver);
-
-MODULE_AUTHOR("Boris BREZILLON <[e-mail]>");
-MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
-MODULE_LICENSE("GPL v2");
+builtin_platform_driver(sun6i_prcm_driver);