drm/amd/display: fix cond_no_effect.cocci warnings

This was found by coccicheck:
./drivers/gpu/drm/amd/display/dc/core/dc_resource.c, 2516, 7-9, WARNING
possible condition with no effect (if == else)

hdmi_info.bits.YQ0_YQ1 is always YYC_QUANTIZATION_LIMITED_RANGE.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Ye Guojin <ye.guojin@zte.com.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -2509,17 +2509,7 @@ static void set_avi_info_frame(
 
 	/* TODO : We should handle YCC quantization */
 	/* but we do not have matrix calculation */
-	if (stream->qy_bit == 1) {
-		if (color_space == COLOR_SPACE_SRGB ||
-			color_space == COLOR_SPACE_2020_RGB_FULLRANGE)
-			hdmi_info.bits.YQ0_YQ1 = YYC_QUANTIZATION_LIMITED_RANGE;
-		else if (color_space == COLOR_SPACE_SRGB_LIMITED ||
-					color_space == COLOR_SPACE_2020_RGB_LIMITEDRANGE)
-			hdmi_info.bits.YQ0_YQ1 = YYC_QUANTIZATION_LIMITED_RANGE;
-		else
-			hdmi_info.bits.YQ0_YQ1 = YYC_QUANTIZATION_LIMITED_RANGE;
-	} else
-		hdmi_info.bits.YQ0_YQ1 = YYC_QUANTIZATION_LIMITED_RANGE;
+	hdmi_info.bits.YQ0_YQ1 = YYC_QUANTIZATION_LIMITED_RANGE;
 
 	///VIC
 	format = stream->timing.timing_3d_format;