usb: atm: ueagle-atm: constify attribute_group structures.

attribute_group are not supposed to change at runtime. All functions
working with attribute_group provided by <linux/sysfs.h> work with
const attribute_group. So mark the non-const structs as const.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/atm/ueagle-atm.c

@@ -2522,7 +2522,7 @@ static struct attribute *attrs[] = {
 	&dev_attr_stat_firmid.attr,
 	NULL,
 };
-static struct attribute_group attr_grp = {
+static const struct attribute_group attr_grp = {
 	.attrs = attrs,
 };