Add platform guard for MicroMod SAMD51

Author: nseidle

src/SparkFun_Ublox_Arduino_Library.h

@@ -56,15 +56,16 @@
 // Boards like the RedBoard Turbo use SerialUSB (not Serial).
 // But other boards like the SAMD51 Thing Plus use Serial (not SerialUSB).
 // The next nine lines let the code compile cleanly on as many SAMD boards as possible.
-#if defined(ARDUINO_ARCH_SAMD)// Is this a SAMD board?
-#if defined(USB_VID)// Is the USB Vendor ID defined?
-#if (USB_VID == 0x1B4F)// Is this a SparkFun board?
-#if !defined(ARDUINO_SAMD51_THING_PLUS) // If it is not a SAMD51 Thing Plus
-#define Serial SerialUSB// Define Serial as SerialUSB
+#if defined(ARDUINO_ARCH_SAMD)// Is this a SAMD board?
+#if defined(USB_VID)// Is the USB Vendor ID defined?
+#if (USB_VID == 0x1B4F)// Is this a SparkFun board?
+#if !defined(ARDUINO_SAMD51_THING_PLUS) & !defined(ARDUINO_SAMD51_MICROMOD) // If it is not a SAMD51 Thing Plus or SAMD51 MicroMod
+#define Serial SerialUSB// Define Serial as SerialUSB
 #endif
 #endif
 #endif
 #endif
+
 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 
 //Define a digital pin to aid checksum failure capture and analysis