Add common functions for LVDS/DC setup, video framebuffer init/disable,
LVDS to HDMI card settings, etc. Refactor it from video_imxdpuv1.c.
1. Add power, clocks, PLL relevant setup for LVDS and DC.
2. Configure the LVDS and its PHY settings for the display format and pixel link.
3. Setup the LVDS to HDMI card.
4. Implement the video_hw_init by calling DC driver API to output data to
   specified display panel.

Signed-off-by: Oliver Brown <oliver.brown@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>