FROMLIST: drm: bridge: dw-hdmi: Enable CSC even for DVI

FROMLIST: drm: bridge: dw-hdmi: Enable CSC even for DVI

If the input pixel format is not RGB, the CSC must be enabled in order to
provide valid pixel to DVI sinks.
This patch removes the hdmi only dependency on the CSC enabling.

Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-4-laurent.pinchart+renesas@ideasonboard.com
Change-Id: I7e9da663158790f7a84e126c6ed8b763a262bd1f
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
(am from https://patchwork.kernel.org/patch/9603293/)