platform/x86: toshiba_acpi: constify attribute_group structures.

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work
with const attribute_group. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
  26360	   1072	     24	  27456	   6b40	drivers/platform/x86/toshiba_acpi.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  26424	   1008	     24	  27456	   6b40	drivers/platform/x86/toshiba_acpi.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

drivers/platform/x86/toshiba_acpi.c

@@ -2419,7 +2419,7 @@ static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
 	return exists ? attr->mode : 0;
 }
 
-static struct attribute_group toshiba_attr_group = {
+static const struct attribute_group toshiba_attr_group = {
 	.is_visible = toshiba_sysfs_is_visible,
 	.attrs = toshiba_attributes,
 };