hwmon: (k10temp) make some symbols static

Fix the following sparse warning:

drivers/hwmon/k10temp.c:189:12: warning: symbol 'k10temp_temp_label' was
not declared. Should it be static?
drivers/hwmon/k10temp.c:202:12: warning: symbol 'k10temp_in_label' was
not declared. Should it be static?
drivers/hwmon/k10temp.c:207:12: warning: symbol 'k10temp_curr_label' was
not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20200409084502.42126-1-yanaijie@huawei.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/k10temp.c

@@ -186,7 +186,7 @@ static long get_raw_temp(struct k10temp_data *data)
 	return temp;
 }
 
-const char *k10temp_temp_label[] = {
+static const char *k10temp_temp_label[] = {
 	"Tctl",
 	"Tdie",
 	"Tccd1",
@@ -199,12 +199,12 @@ const char *k10temp_temp_label[] = {
 	"Tccd8",
 };
 
-const char *k10temp_in_label[] = {
+static const char *k10temp_in_label[] = {
 	"Vcore",
 	"Vsoc",
 };
 
-const char *k10temp_curr_label[] = {
+static const char *k10temp_curr_label[] = {
 	"Icore",
 	"Isoc",
 };