drm/amd/display: wait for test pattern after when all pipes are programmed

[why]
Currently we wait for test pattern after each pipe is programmed.  For
ODM combined scenario it will cause test pattern is shown on only half
screen for 1 frame. This is not desirable.

[how]
No wait between odm pipe programming, only wait after all pipes are
programmed.

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

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

@@ -3657,12 +3657,6 @@ static void set_crtc_test_pattern(struct dc_link *link,
 					NULL,
 					width,
 					height);
-				/* wait for dpg to blank pixel data with test pattern */
-				for (count = 0; count < 1000; count++)
-					if (odm_opp->funcs->dpg_is_blanked(odm_opp))
-						break;
-					else
-						udelay(100);
 			}
 			opp->funcs->opp_set_disp_pattern_generator(opp,
 				controller_test_pattern,