coresight: etb10: Make coresight_etb_groups static

Fix the following sparse warning:

drivers/hwtracing/coresight/coresight-etb10.c:720:30: warning: symbol
'coresight_etb_groups' was not declared. Should it be static?

Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Jason Yan <[email protected]>
Signed-off-by: Mathieu Poirier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: JasonYanHw

drivers/hwtracing/coresight/coresight-etb10.c

@@ -717,7 +717,7 @@ static const struct attribute_group coresight_etb_mgmt_group = {
 	.name = "mgmt",
 };
 
-const struct attribute_group *coresight_etb_groups[] = {
+static const struct attribute_group *coresight_etb_groups[] = {
 	&coresight_etb_group,
 	&coresight_etb_mgmt_group,
 	NULL,