Alternative MKR form factor detection

Author: sandeepmistry

src/MCP2515.h

@@ -12,7 +12,7 @@
 
 #define MCP2515_DEFAULT_CLOCK_FREQUENCY 16e6
 
-#if defined(ARDUINO_ARCH_SAMD) && defined(USB_VID) && (USB_VID == 0x2341) && !defined(ARDUINO_SAMD_ZERO)
+#if defined(ARDUINO_ARCH_SAMD) && defined(PIN_SPI_MISO) && defined(PIN_SPI_MOSI) && defined(PIN_SPI_SCK) && (PIN_SPI_MISO == 10) && (PIN_SPI_MOSI == 8) && (PIN_SPI_SCK == 9)
 // Arduino MKR board: MKR CAN shield CS is pin 3, INT is pin 7
 #define MCP2515_DEFAULT_CS_PIN          3
 #define MCP2515_DEFAULT_INT_PIN         7