platform/x86: compal-laptop: 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
   6781	   6144	     34	  12959	   329f	drivers/platform/x86/compal-laptop.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   6845	   6080	     34	  12959	   329f	drivers/platform/x86/compal-laptop.o

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

drivers/platform/x86/compal-laptop.c

@@ -718,7 +718,7 @@ static struct attribute *compal_platform_attrs[] = {
 	&dev_attr_wake_up_mouse.attr,
 	NULL
 };
-static struct attribute_group compal_platform_attr_group = {
+static const struct attribute_group compal_platform_attr_group = {
 	.attrs = compal_platform_attrs
 };