msm: mdss: switch the lut only at display update on 8x10

For the command mode panel, the look up table can be updated
when there is a pending DMA transaction.   This can cause
both quality and dma hang.  The look up table change is
delayed until the next frame update for the command mode
panel.

Change-Id: If50404275e86df0c1ec7700fcdbc8d350f618e42
Signed-off-by: Xiaoming Zhou <zhoux@codeaurora.org>