Fix table row of the DSP48 post synthesis resource utilization report

According to the last synthesis I ran using Vitis/Vivado 2022.2, the
DSP48 utilization seems to be reported in row 10 of the XML table.

src/finn/analysis/fpgadataflow/post_synth_res.py

@@ -65,7 +65,7 @@ def post_synth_res(model, override_synth_report_filename=None):
         "FF": 6,
         "BRAM_36K": 7,
         "BRAM_18K": 8,
-        "DSP48": 9,
+        "DSP48": 10,
     }
     restype_to_ind_vitis = {
         "LUT": 4,