ENGR00302472-6 video: mxc: LDB driver refactor

This patch almost reworks the LDB driver to make the
implementation simpler and clearer.  The new version
should support all the LDB modules embedded in imx53,
imx6qdl and imx6sx.  The lvds-channel subsidiary DT
node is introduced to represent each LVDS channel.
People may specify a channel's CRTC, working mode(dual
mode or split mode), data width, data mapping, display
timing and if it is a primary channel in the node.

Change logs:
* Use CTRC concept so that the driver may support both
  IPU and LCDIF as the display engines.
* Add mxc dispdrv enable() callback.
* Cache LDB ctrl register value at probe()/setup()/
  enable() stages and finally write to the register at
  enable() stage.
* Simplify logics for setting ctrl/bus muxing/clocks.
* Use regmap to write crtl and bus muxing registers.
* Remove LDB description in DT binding doc fsl_ipuv3_fb.txt.
  Instead, add a new one in fsl,ldb.txt.

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>

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