Improvement for EDID debugging
Patch for EDID in case preferred timing is read from basic EDID block.
Conflicts:
	drivers/video/rockchip/hdmi/hdmi-lcdc.c
Patch for find the best video mode using all nine cases (formerly only
two cases are recognized).
Add some export directives to prevent compilation errors in some cases
where usb is used as module.
RK: return -ENOIOCTLCMD in rk3188_lcdc.c default case
RR: return framebuffer .io_* funcctions from board-*box.c code
it66121: revert reg REG_TX_PLL_CTRL value to improve tmds signal jitter.

Conflicts:
	drivers/video/rockchip/hdmi/it66121/hdmitx_drv.c