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/apalis-imx8.h b/include/configs/apalis-imx8.h
index c87bcd4..a45a6ff 100644
--- a/include/configs/apalis-imx8.h
+++ b/include/configs/apalis-imx8.h
@@ -38,6 +38,7 @@
 	BOOTENV \
 	MEM_LAYOUT_ENV_SETTINGS \
 	"boot_file=Image\0" \
+	"boot_script_dhcp=boot.scr\0" \
 	"console=ttyLP1 earlycon\0" \
 	"fdt_addr=0x83000000\0"	\
 	"fdt_file=fsl-imx8qm-apalis-eval.dtb\0" \