tools/litex_term: increase workaround delay for usb_fifo. (validated on Minispartan6 and MimasA7).

Still needs to be fixed properly.

litex/tools/litex_term.py

@@ -224,7 +224,7 @@ class LiteXTerm:
             current_address += len(frame_data)
             position += len(frame_data)
             remaining -= len(frame_data)
-            time.sleep(1e-6) # FIXME: small delay needed with FT245 FIFO ("usb_fifo"), understand why.
+            time.sleep(1e-4) # FIXME: small delay needed with FT245 FIFO ("usb_fifo"), understand why.
         end = time.time()
         elapsed = end - start
         f.close()