video: cfb_console.c: add support for RLE8 bitmaps

Allow displaying 8-bit RLE BMP images.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/README b/README
index 940b507..bb13bc6 100644
--- a/README
+++ b/README
@@ -1133,6 +1133,12 @@
 		images, gzipped BMP images can be displayed via the
 		splashscreen support or the bmp command.
 
+- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
+
+		If this option is set, 8-bit RLE compressed BMP images
+		can be displayed via the splashscreen support or the
+		bmp command.
+
 - Compression support:
 		CONFIG_BZIP2