drm/amdgpu/display: Fix a mistake in revert commit

[why]
It is to fix in try_disable_dsc() due to misrevert of
commit 338567d1 ("drm/amd/display: Fix MST BW calculation Regression")

[How]
Fix restoring minimum compression bw by 'max_kbps', instead of native bw 'stream_kbps'
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1072,7 +1072,7 @@ static int try_disable_dsc(struct drm_atomic_state *state,
 			vars[next_index].bpp_x16 = 0;
 		} else {
 			DRM_DEBUG_DRIVER("MST_DSC index #%d, restore minimum compression\n", next_index);
-			vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.stream_kbps, fec_overhead_multiplier_x1000);
+			vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.max_kbps, fec_overhead_multiplier_x1000);
 			ret = drm_dp_atomic_find_time_slots(state,
 							    params[next_index].port->mgr,
 							    params[next_index].port,