[Inky] autodetect board opts and pHAT v2 support

[Thereatra]

I have added auto opts detect and dev struct creationg with defaults from the detected opts as mentioned in #11.

While I was at it I also added support for pHAT v2 which is simply a pHAT with a small resolution difference.

[codecov-io]

Codecov Report

Merging #12 (918ef54) into main (c53a296) will decrease coverage by 0.7%. The diff coverage is 0.0%.

@@           Coverage Diff           @@
##            main     #12     +/-   ##
=======================================
- Coverage   60.7%   59.9%   -0.7%     
=======================================
  Files         48      48             
  Lines       4250    4302     +52     
=======================================
  Hits        2578    2578             
- Misses      1541    1593     +52     
  Partials     131     131             

Impacted Files	Coverage Δ
inky/inky.go	0.0% <0.0%> (ø)

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[Thereatra]

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[Thereatra]

I've changed it so DetectOpts and the related functions all use an open port instead.

I guess I just assumed that the display would always run on a raspberry pi with linux as it is built for. I have removed the hardcoded SPI port as specified, however the NewDetected still relies on the assumption that the Inky is used as a pi hat with the specific gpio ports. I personally feel like this makes sense due to the nature of the board, but if it's out of scope/too specific for a device driver, then it's probably better to just remove the function rather than make it take the same parameters as New minus the opts param.

[maruel]

Thanks! Apologies for the slow back and forth.

One potential follow up: I think it would be interesting to add an example about how to leverage the new function in https://github.com/periph/devices/blob/main/inky/example_test.go.