sh: make mm/asids-debugfs explicitly non-modular

The Makefile/Kconfig currently controlling compilation of this code is:

obj-$(CONFIG_DEBUG_FS) += $(debugfs-y)
debugfs-y := asids-debugfs.o

lib/Kconfig.debug:config DEBUG_FS
lib/Kconfig.debug: bool "Debug Filesystem"

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

Lets remove the couple traces of modular code, so that when reading the
driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

Cc: Yoshinori Sato <[e-mail]>
Cc: Rich Felker <[e-mail]>
Cc: [e-mail]
Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Rich Felker <[e-mail]>

arch/sh/mm/asids-debugfs.c

···
  * for more details.
  */
 #include <linux/init.h>
-#include <linux/module.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/spinlock.h>
···
 
 	return PTR_ERR_OR_ZERO(asids_dentry);
 }
-module_init(asids_debugfs_init);
-
-MODULE_LICENSE("GPL v2");
+device_initcall(asids_debugfs_init);