rk_fb & rk3036 lcdc & rk312x lcdc:

rk_fb & rk3036 lcdc & rk312x lcdc:
        1. Modify box display policy, rk_fb_update_reg() need to check yuv420
           format.
        2. When power up in uboot logo mode, if rk_fb_switch_screen input screen
           type is not equal to current screen type, exit uboot logo mode. For
           the case of display interface change happen at the moment of kernel
           initialization.
        3. Fox box, if RK_FBIOSET_YUV_ADDR input address is zero, we close related
           lcdc layer. Because RK_FBIOSET_ENABLE may not be called by application,
           especially at low memory enviorment,such as rk3036 256M ram.

        Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>