Set BOOTCMD and remove boot delay

Set BOOTCMD to "ums 0" to automatically binds usb_dnl_ums driver.
Remove boot delay.

include/configs/vf610twr.h

@@ -123,11 +123,12 @@
 #define CONFIG_PHY_MICREL
 #endif
 
-#define CONFIG_BOOTDELAY		3
+#define CONFIG_BOOTDELAY		0
 
 #define CONFIG_LOADADDR			0x3f400000
 #define CONFIG_SYS_TEXT_BASE		0x3f008000
 
+/*
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"script=boot.scr\0" \
 	"uimage=uImage\0" \
@@ -214,6 +215,8 @@
 			   "fi; " \
 		   "fi; " \
 	   "else run netboot; fi"
+*/
+#define CONFIG_BOOTCOMMAND "ums 0"
 
 /* Miscellaneous configurable options */
 #define CONFIG_SYS_LONGHELP		/* undef to save memory */