Revert "Merge branch 'mcp23017' of github.com:Fredyy90/RaspberryPi-FanControl into mcp23017"

This reverts commit 715aef86a618dbb67a13d21b62138791ec9e3934, reversing
changes made to 9a8619d550692f53b2f0fed713ed3daf743133e9.