Fixed explicit soft reset for w5500.

Author: BiffoBear

adafruit_wiznet5k/adafruit_wiznet5k.py

@@ -477,8 +477,8 @@ def _detect_and_reset_w5500() -> bool:
             """
             self._chip_type = "w5500"
             self._write_mr(0x80)
-            if self._read_mr():
-                return False
+            while self._read_mr()[0] & 0x80:
+                pass
 
             # assert self.sw_reset() == 0, "Chip not reset properly!"
             self._write_mr(0x08)