toradex: set default dhcp distroboot scriptname

Use the same name of DHCP Distroboot script as in regular eMMC case.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/include/configs/colibri_imx6.h b/include/configs/colibri_imx6.h
index 0d1a1bc..956b59f 100644
--- a/include/configs/colibri_imx6.h
+++ b/include/configs/colibri_imx6.h
@@ -92,6 +92,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	BOOTENV \
 	"boot_file=zImage\0" \
+	"boot_script_dhcp=boot.scr\0" \
 	"console=ttymxc0\0" \
 	"defargs=enable_wait_mode=off galcore.contiguousSize=50331648\0" \
 	"fdt_file=" FDT_FILE "\0" \