drm: bridge: dw-hdmi: remove unused hdmi_bus_fmt_is_yuv420

Remove usused yet hdmi_bus_fmt_is_yuv420 function.

Fixes: def23aa7e982 ("drm: bridge: dw-hdmi: Switch to V4L bus format and encodings")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1491377579-9353-1-git-send-email-narmstrong@baylibre.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

@@ -605,20 +605,6 @@ static bool hdmi_bus_fmt_is_yuv422(unsigned int bus_format)
 	}
 }
 
-static bool hdmi_bus_fmt_is_yuv420(unsigned int bus_format)
-{
-	switch (bus_format) {
-	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
-	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
-	case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
-	case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
-		return true;
-
-	default:
-		return false;
-	}
-}
-
 static int hdmi_bus_fmt_color_depth(unsigned int bus_format)
 {
 	switch (bus_format) {