drm/komeda: remove unused struct 'gamma_curve_segment'

'gamma_curve_segment' looks like it has never been used.
Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240516133724.251750-1-linux@treblig.org
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

Author: Dr. David Alan Gilbert

drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c

@@ -72,11 +72,6 @@ struct gamma_curve_sector {
 	u32 segment_width;
 };
 
-struct gamma_curve_segment {
-	u32 start;
-	u32 end;
-};
-
 static struct gamma_curve_sector sector_tbl[] = {
 	{ 0,    4,  4   },
 	{ 16,   4,  4   },