Convert CONFIG_IMX_VIDEO_SKIP et al to Kconfig

This converts the following to Kconfig:
   CONFIG_IMX_VIDEO_SKIP
   CONFIG_IMX_HDMI

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cm_fx6_defconfig b/configs/cm_fx6_defconfig
index ea75966..217752c 100644
--- a/configs/cm_fx6_defconfig
+++ b/configs/cm_fx6_defconfig
@@ -116,6 +116,7 @@
 CONFIG_VIDEO=y
 CONFIG_VIDEO_LOGO=y
 CONFIG_VIDEO_IPUV3=y
+CONFIG_IMX_HDMI=y
 CONFIG_SPLASH_SCREEN=y
 CONFIG_SPLASH_SOURCE=y
 CONFIG_FDT_FIXUP_PARTITIONS=y