imx: icore: fix splash logo drawing

Define "splashimage" variable in the default environment
and enable BMP code. Also configure white on black for
video console.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/include/configs/imx6-engicam.h b/include/configs/imx6-engicam.h
index 56b3c75..0826195 100644
--- a/include/configs/imx6-engicam.h
+++ b/include/configs/imx6-engicam.h
@@ -37,6 +37,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"script=boot.scr\0" \
 	"splashpos=m,m\0" \
+	"splashimage=" __stringify(CONFIG_LOADADDR) "\0" \
 	"image=uImage\0" \
 	"fit_image=fit.itb\0" \
 	"fdt_high=0xffffffff\0" \