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/mx53cx9020_defconfig b/configs/mx53cx9020_defconfig
index b34f2e7..c20c6a4 100644
--- a/configs/mx53cx9020_defconfig
+++ b/configs/mx53cx9020_defconfig
@@ -40,3 +40,4 @@
 # CONFIG_VIDEO_BPP32 is not set
 CONFIG_SYS_WHITE_ON_BLACK=y
 CONFIG_VIDEO_IPUV3=y
+CONFIG_IMX_VIDEO_SKIP=y