Added a reset to w5500 chip detection.

Author: BiffoBear

adafruit_wiznet5k/adafruit_wiznet5k.py

@@ -476,6 +476,10 @@ def _detect_and_reset_w5500() -> bool:
             :return bool: True if a W5500 chip is detected, False if not.
             """
             self._chip_type = "w5500"
+            self._write_mr(0x80)
+            if self._read_mr():
+                return False
+
             # assert self.sw_reset() == 0, "Chip not reset properly!"
             self._write_mr(0x08)
             # assert self._read_mr()[0] == 0x08, "Expected 0x08."