DSI panel driver need attach function which is include in
mipi_dsi_host_ops.

If mipi_dsi_host_register is not in probe, dsi panel will
probe more delay.

So move the mipi_dsi_host_register to probe from bind.
Signed-off-by: NJitao Shi <jitao.shi@mediatek.com>
Signed-off-by: NCK Hu <ck.hu@mediatek.com>