drm/amd/display: Fix access of wrong array element TF format conversion

Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:357
convert_to_custom_float() error: buffer overflow 'arr_points' 2 <= 2
drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:358
convert_to_custom_float() warn: buffer overflow 'arr_points' 2 <= 2

Regression:
drm/amd/display: Remove extra arr_points element

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -354,8 +354,8 @@ static bool convert_to_custom_float(struct pwl_result_data *rgb_resulted,
 		return false;
 	}
 
-	if (!convert_to_custom_float_format(arr_points[2].slope, &fmt,
-					    &arr_points[2].custom_float_slope)) {
+	if (!convert_to_custom_float_format(arr_points[1].slope, &fmt,
+					    &arr_points[1].custom_float_slope)) {
 		BREAK_TO_DEBUGGER();
 		return false;
 	}