mx6: Factor out common HDMI setup code

Instead of duplicating HDMI setup code for every mx6 board, factor out the common code

Signed-off-by: Pardeep Kumar Singla <b45784@freescale.com>
Acked-By: Eric Nelson <eric.nelson@boundarydevices.com>
diff --git a/include/configs/wandboard.h b/include/configs/wandboard.h
index dd06bd7..1f83e89 100644
--- a/include/configs/wandboard.h
+++ b/include/configs/wandboard.h
@@ -100,6 +100,7 @@
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_VIDEO_BMP_LOGO
 #define CONFIG_IPUV3_CLK 260000000
+#define CONFIG_IMX_HDMI
 
 #if defined(CONFIG_MX6DL)
 #define CONFIG_DEFAULT_FDT_FILE		"imx6dl-wandboard.dtb"