drm/amd/display: Set stream's DP test pattern upon test request

[Why]
A recent refactor of DC's DP test pattern automation code requires the
DC stream's test pattern and test pattern color space fields to be
correctly populated before calling dc_link_dp_set_test_pattern.

[How]
Populate stream's test pattern type and color space fields before
calling into DC to program DP test pattern.
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Hersen Wu <hersenxs.wu@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

@@ -1216,6 +1216,9 @@ bool dm_helpers_dp_handle_test_pattern_request(
 
 	}
 
+	pipe_ctx->stream->test_pattern.type = test_pattern;
+	pipe_ctx->stream->test_pattern.color_space = test_pattern_color_space;
+
 	dc_link_dp_set_test_pattern(
 		(struct dc_link *) link,
 		test_pattern,