drm/amd/display: add stream clock source to DP DTO params

[WHY&HOW]
Stream clock source is a required parameter for DP DTO programming.
Reviewed-by: Chris Park <chris.park@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h

@@ -59,6 +59,7 @@ enum dentist_dispclk_change_mode {
 struct dp_dto_params {
 	int otg_inst;
 	enum signal_type signal;
+	enum streamclk_source clk_src;
 	uint64_t pixclk_hz;
 	uint64_t refclk_hz;
 };