drivers/char: make SGI snsc.c driver explicitly non-modular

The Kconfig for this driver is currently:

config SGI_SNSC
bool "SGI Altix system controller communication support"

...meaning that it currently is not being built as a module by anyone.
Lets remove all modular references, 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: Arnd Bergmann <[e-mail]>
Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/char/snsc.c

···
 #include <linux/sched.h>
 #include <linux/device.h>
 #include <linux/poll.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <asm/sn/io.h>
···
 	}
 	return 0;
 }
-
-module_init(scdrv_init);
+device_initcall(scdrv_init);