Added legacy pin coverager for nano boards

Author: mjs513

Diff for: variants/arduino_nano_33_ble/variant.h

@@ -3,3 +3,11 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+
+// TODO: correctly handle these legacy defines
+#define MOSI    0
+#define MISO    0
+#define SCK     0
+#define SS      0
+#define SDA     0
+#define SCL     0

Diff for: variants/arduino_nano_33_ble_sense/variant.h

@@ -3,3 +3,11 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+
+// TODO: correctly handle these legacy defines
+#define MOSI    0
+#define MISO    0
+#define SCK     0
+#define SS      0
+#define SDA     0
+#define SCL     0

Diff for: variants/arduino_nano_33_iot/variant.h

@@ -3,3 +3,11 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+
+// TODO: correctly handle these legacy defines
+#define MOSI    0
+#define MISO    0
+#define SCK     0
+#define SS      0
+#define SDA     0
+#define SCL     0