uboot-imx

imx: mx6ul_14x14_evk: support lcdif display

Support lcdif display:
1. Add pinmux and pad settings for LCDIF
2. Introduce setup_lcd to do the settings for LCDIF
3. Enable VIDEO related macros in board header files
4. Add a new env videomode which is needed by mxsfb.c. The
   settings for videomode in this patch is for TFT43AB.
5. Tested on mx6ul 14x14/9x9 evk.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>