include: configs: tegra-common-post: make usb first boot target

This ensures that the device can boot from a USB device prior to MMC. Useful
cases are when installing a new OS from USB while MMC still has a working OS
configuration or if the OS configuration is broken in late boot stages
(kernel boots but the system does not start).

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/include/configs/tegra-common-post.h b/include/configs/tegra-common-post.h
index fc74980..2f08dfe 100644
--- a/include/configs/tegra-common-post.h
+++ b/include/configs/tegra-common-post.h
@@ -7,7 +7,7 @@
 #ifndef __TEGRA_COMMON_POST_H
 #define __TEGRA_COMMON_POST_H
 
-#define BOOT_TARGETS	"mmc1 mmc0 usb pxe dhcp"
+#define BOOT_TARGETS	"usb mmc1 mmc0 pxe dhcp"
 
 #ifdef CONFIG_TEGRA_KEYBOARD
 #define STDIN_KBD_KBC ",tegra-kbc"