Revert "drm/amd/display: Validate hw_points_num before using it"

This reverts commit 58c3b334.

[WHY & HOW]
The writeback series cause a regression in thunderbolt display.
Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c

@@ -243,9 +243,6 @@ static bool dwb3_program_ogam_lut(
 		return false;
 	}
 
-	if (params->hw_points_num == 0)
-		return false;
-
 	REG_SET(DWB_OGAM_CONTROL, 0, DWB_OGAM_MODE, 2);
 
 	current_mode = dwb3_get_ogam_current(dwbc30);