Add four main boot methods to developer build

include/configs/chromeos/tegra2/common.h

Index: include/configs/chromeos/tegra2/common.h
diff --git a/include/configs/chromeos/tegra2/common.h b/include/configs/chromeos/tegra2/common.h
index 5b29ac876459c9f7d82c8ab7a8bd1691a9064344..9fd3a626118e3791b057808b4f2d84dcbe66ced4 100644
--- a/include/configs/chromeos/tegra2/common.h
+++ b/include/configs/chromeos/tegra2/common.h
@@ -67,25 +67,6 @@
 
 #define CONFIG_LOADADDR			0x40C000
 #define CONFIG_BOOTDELAY		2	/* 2s to break to prompt */
-#define CONFIG_EXTRA_ENV_SETTINGS_ARCH \
-	"scriptaddr=0x408000\0" \
-	"script_img=/u-boot/boot.scr.uimg\0" \
-	"mmc0_boot=setenv devnum 0; run mmc_boot;\0" \
-	"mmc1_boot=setenv devnum 1; run mmc_boot;\0" \
-	"usb0_boot=usb start 0; run usb_boot;\0" \
-	"usb1_boot=usb start 1; run usb_boot;\0" \
-	"scr_boot=fatload ${devtype} ${devnum}:c ${scriptaddr} ${script_img};" \
-		"source ${scriptaddr};" \
-		"read ${devtype} ${devnum}:${kernelpart} ${scriptaddr} 0 10;" \
-		"source ${scriptaddr};\0" \
-	"mmc_boot=mmc init ${devnum};" \
-		"setenv devtype mmc;" \
-	        "setenv devname mmcblk${devnum}p;" \
-		"run scr_boot;\0" \
-	"usb_boot=setenv devtype usb;" \
-		"setenv devnum 0;" \
-		"setenv devname sda;" \
-		"run scr_boot;\0"
 
 #define CONFIG_SYS_LOAD_ADDR		0xA00800