imx: ventana: fix splash logo drawing

After mxc_ipuv3 DM_VIDEO conversion showing splash image
doesn't work. Fix this by adding new requirements:
- splashimage env variable.
- CONFIG_SPLASH_SCREEN
- CONFIG_CMD_BMP

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h
index 3f6afc1..170d6a7 100644
--- a/include/configs/gw_ventana.h
+++ b/include/configs/gw_ventana.h
@@ -107,6 +107,7 @@
 
 #define CONFIG_EXTRA_ENV_SETTINGS_COMMON \
 	"splashpos=m,m\0" \
+	"splashimage=" __stringify(CONFIG_LOADADDR) "\0" \
 	"usb_pgood_delay=2000\0" \
 	"console=ttymxc1\0" \
 	"bootdevs=usb mmc sata flash\0" \