extcon: Remove unused CABLE_NAME_MAX definition

This patch removes the unused CABLE_NAME_MAX definition.
Signed-off-by: Chanwoo Choi <cwchoi00@gmail.com>

drivers/extcon/extcon.c

@@ -37,7 +37,6 @@
 #include "extcon.h"
 
 #define SUPPORTED_CABLE_MAX	32
-#define CABLE_NAME_MAX		30
 
 struct __extcon_info {
 	unsigned int type;