Add support for second hw SPI

[maxholgasson]

Hi, is it possible to add a second hardware SPI to the GFX library besides of the default SPI?

[kmsmi]

I join the question. Is it possible to use a second SPI?

[ladyada]

pass in SPIclass here
https://github.com/adafruit/Adafruit-GFX-Library/blob/master/Adafruit_SPITFT.h#L145

[kmsmi]

Thanks.