extcon: max8997: Make max8997_extcon_cable static

'max8997_extcon_cable' is used only in this file. Hence make it static.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NMyungjoo Ham <myungjoo.ham@samsung.com>

drivers/extcon/extcon-max8997.c

@@ -109,7 +109,7 @@ struct max8997_muic_info {
 	struct extcon_dev	*edev;
 };
 
-const char *max8997_extcon_cable[] = {
+static const char *max8997_extcon_cable[] = {
 	[0] = "USB",
 	[1] = "USB-Host",
 	[2] = "TA",