drm/amd/display: add support for 2nd sharpening range

[Why & How]
Add support for 2nd sharpening range for cases where we want
override existing DCN sharpening range.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Samson Tam

drivers/gpu/drm/amd/display/dc/sspl/dc_spl_types.h

@@ -480,6 +480,10 @@ enum sharpness_setting	{
 	SHARPNESS_ZERO,
 	SHARPNESS_CUSTOM
 };
+enum sharpness_range_source	{
+	SHARPNESS_RANGE_DCN = 0,
+	SHARPNESS_RANGE_DCN_OVERRIDE
+};
 struct spl_sharpness_range {
 	int sdr_rgb_min;
 	int sdr_rgb_max;