sh: don't use module_init in non-modular psw.c code

The psw.o is built for obj-y -- and hence this code is always
present.  It will never be modular, so using module_init as an alias
for __initcall can be somewhat misleading.

Fix this up now, so that we can relocate module_init from
init.h into module.h in the future.  If we don't do this, we'd
have to add module.h to obviously non-modular code, and that
would be a worse thing.

Note that direct use of __initcall is discouraged, vs. one
of the priority categorized subgroups.  As __initcall gets
mapped onto device_initcall, our use of device_initcall
directly in this change means that the runtime impact is
zero -- it will remain at level 6 in initcall ordering.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

arch/sh/boards/mach-landisk/psw.c

@@ -140,4 +140,4 @@ static int __init psw_init(void)
 {
 	return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
 }
-module_init(psw_init);
+device_initcall(psw_init);