ssd1306: Refactor display options

[czechbol]

I hit an issue where I needed to horizontally mirror the image and I could not figure out how to do it with the current state of the implementation.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 47.1%. Comparing base (f9d4688) to head (f76a578).

Files with missing lines	Patch %	Lines
ssd1306/ssd1306smoketest/ssd1306smoketest.go	0.0%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #77     +/-   ##
=======================================
- Coverage   47.1%   47.1%   -0.1%     
=======================================
  Files         83      83             
  Lines      10270   10280     +10     
=======================================
- Hits        4842    4837      -5     
- Misses      5251    5263     +12     
- Partials     177     180      +3     

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[maruel]

Thanks!