This patch adds the CH7301 HDMI options and the common configuration
for DCU on LS1021AQDS board.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Alison Wang <alison.wang@freescale.com>
Cc: Jason Jin <Jason.Jin@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>