msm: display: hdmi: make CEC work properly after HDMI off and on

When HDMI is turned off, sending CEC will crash the system
and the logical address will be lost. Do not send CEC message
if CEC is not configured. Initialize CEC logical address when
config CEC during turning on HDMI. Return an error when sending
message fails so that HAL can know the result.

Change-Id: I2f5ced4d9be97361665138400bde435916c7373e
Signed-off-by: Ken Zhang <kenz@codeaurora.org>