libvideorender: CB2 fix video freezen [1/1]

PD#OTT-50504

Problem:
when plugin in/out HDMI, it causes video video
freezen

Solution:
1.drmWaitVBlank will return when drm mode changing.
so we should skip this error and do next loop to send
frame
2.send black frame to drm when paused state

Verify:
ap222

Change-Id: Idd5899ed9ebed8b691289e86e1d589a3a012c2fe
Signed-off-by: fei.deng <fei.deng@amlogic.com>
4 files changed