hdmitx: s6 uboot pxp bringup [1/1]

PD#SWPL-156500

Problem:
s6 pxp bringup in uboot

Solution:
complete it

Verify:
pxp

Change-Id: I6ff496f5406b9ea0ccb77fdcc31d2066dd792b1a
Signed-off-by: ruofei.zhao <ruofei.zhao@amlogic.com>
21 files changed