MCP2515 Modification to support ESP32

[HJuliamPR]

Hello.

I tried to modify to make work the ESP32 with the MCP2515 by ARDUINO_ARCH_ESP32 ifdef conditionals to make it use the MCP2515 lib, but there are some functions like SPI.usingInterrupt(digitalPinToInterrupt(_intPin)) and SPI.notUsingInterrupt(digitalPinToInterrupt(_intPin)) that are only avaiable in AVR microships. "pierremolinaro/acan2517#1" In the link you could see how they solved a similar problem, however, I wasn´t able to use it in arduino-CAN Library. if someone can solved it, please let us know how do it. Good day, by the way.