include: configs: ge: bx50v3: drop USB boot

Remove unsupported USB boot.
Signed-off-by: NIan Ray <ian.ray@ge.com>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.com>

include/configs/ge_bx50v3.h

@@ -125,13 +125,8 @@
 		"run tryboot; " \
 	"fi; " \
 
-#define CONFIG_USBBOOTCOMMAND \
-	"echo Unsupported; " \
-
 #ifdef CONFIG_CMD_NFS
 #define CONFIG_BOOTCOMMAND CONFIG_NETWORKBOOTCOMMAND
-#elif CONFIG_CMD_USB
-#define CONFIG_BOOTCOMMAND CONFIG_USBBOOTCOMMAND
 #else
 #define CONFIG_BOOTCOMMAND CONFIG_MMCBOOTCOMMAND
 #endif