msm: mdss: hdmi: don't reset CEC while triggering message send

Toggling CEC_ENABLE bit will disrupt cec rx engine and might
lead to corruption in received messages. Do CEC reset on CEC_ERROR.

Change-Id: If6bb085f249fa3e46c9d3f8d8fb01f24ca02c893
Signed-off-by: Venkata Prahlad Valluru <vvalluru@codeaurora.org>