ENGR00306875-2 video: mxc_hdmi: Set hdmi cable state a bit earilier

ENGR00306875-2 video: mxc_hdmi: Set hdmi cable state a bit earilier

During hdmi hotplug test, there's a possibility that X-server unblanks
the frame buffer while HDMI-audio just gets the signal to start playback.
Then audio would get an unblanked state right before the playback and
bypassed the DMA enabling code. So this issue is caused by the race
between unblank and set_cable_state().

This patch sets the hdmi cable state a bit earilier so as to let audio
play first. If unblank happens later, the hdmi core and hdmi audio would
be robust enough to handle that case as long as it's not racing with the
other parts.

Acked-by: Sandor Yu <R01008@freescale.com>
Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>