include: configs: ge: bx50v3: drop USB boot

Remove unsupported USB boot.

Signed-off-by: Ian Ray <ian.ray@ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
diff --git a/include/configs/ge_bx50v3.h b/include/configs/ge_bx50v3.h
index 2d854af..f1e0ec5 100644
--- a/include/configs/ge_bx50v3.h
+++ b/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