Remove ivars from default Hardware::CPU methods
Remove ivars from default Hardware::CPU methods

These methods are always overridden in the per-OS modules, so let's just
provide sensible defaults for documentation purposes.

gregory-nisbet/brew,EricFromCanada/brew,claui/brew,konqui/brew,staticfloat/brew,mgrimes/brew,Homebrew/brew,hanxue/linuxbrew,aw1621107/brew,DomT4/brew,muellermartin/dist,bfontaine/brew,toonetown/homebrew,ilovezfs/brew,mistydemeo/homebrew,JCount/brew,amar-laksh/brew_sudo,rwhogg/brew,reelsense/brew,DomT4/brew,mistydemeo/homebrew,reitermarkus/brew,vitorgalvao/brew,MikeMcQuaid/brew,JCount/brew,JCount/brew,maxim-belkin/brew,Linuxbrew/brew,alyssais/brew,toonetown/homebrew,gordonmcshane/homebrew,mahori/brew,aw1621107/brew,AnastasiaSulyagina/brew,reitermarkus/brew,alyssais/brew,pseudocody/brew,tonyg/homebrew,EricFromCanada/brew,maxim-belkin/brew,JCount/brew,toonetown/homebrew,sjackman/homebrew,Homebrew/brew,reelsense/brew,sjackman/homebrew,vitorgalvao/brew,alyssais/brew,gordonmcshane/homebrew,AnastasiaSulyagina/brew,claui/brew,MikeMcQuaid/brew,reelsense/brew,palxex/brew,amar-laksh/brew_sudo,EricFromCanada/brew,rwhogg/brew,nandub/brew,mgrimes/brew,Linuxbrew/brew,mahori/brew,bfontaine/brew,vitorgalvao/brew,pseudocody/brew,jmsundar/brew,aw1621107/brew,mgrimes/brew,mahori/brew,claui/brew,palxex/brew,muellermartin/dist,sjackman/homebrew,hanxue/linuxbrew,palxex/brew,MikeMcQuaid/brew,EricFromCanada/brew,Homebrew/brew,DomT4/brew,staticfloat/brew,zmwangx/brew,sjackman/homebrew,Homebrew/brew,mahori/brew,rwhogg/brew,gregory-nisbet/brew,hanxue/linuxbrew,staticfloat/brew,zmwangx/brew,tonyg/homebrew,claui/brew,tonyg/homebrew,gordonmcshane/homebrew,vitorgalvao/brew,Linuxbrew/brew,maxim-belkin/brew,gregory-nisbet/brew,ilovezfs/brew,mistydemeo/homebrew,nandub/brew,konqui/brew,bfontaine/brew,nandub/brew,muellermartin/dist,Linuxbrew/brew,jmsundar/brew,jmsundar/brew,zmwangx/brew,DomT4/brew,konqui/brew,amar-laksh/brew_sudo,AnastasiaSulyagina/brew,MikeMcQuaid/brew,reitermarkus/brew,konqui/brew,nandub/brew,pseudocody/brew,reitermarkus/brew,ilovezfs/brew