imx: wandboard: fix splash logo drawing

After mxc_ipuv3 DM_VIDEO conversion showing splash image
doesn't work. Fix this. Also enable white on black console
configuration as it used to be with cfb_console driver.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/include/configs/wandboard.h b/include/configs/wandboard.h
index bdcd5e9..8faf5f0 100644
--- a/include/configs/wandboard.h
+++ b/include/configs/wandboard.h
@@ -61,6 +61,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"console=ttymxc0\0" \
 	"splashpos=m,m\0" \
+	"splashimage=" __stringify(CONFIG_LOADADDR) "\0" \
 	"fdtfile=undefined\0" \
 	"fdt_high=0xffffffff\0" \
 	"initrd_high=0xffffffff\0" \