- config/ia64/*: Don't built i2c-amd756-s4882 and i2c-nforce2-s4985
      on ia64, these are motherboard-specific drivers for x86_64
      motherboards.
    - config/powerpc/*: Don't built i2c-isch on powerpc, it is a driver
      for x86 hardware.
    - config/*: Don't built i2c-simtec on i386, x86_64 and ia64, there
      is no Simtec hardware based on these architectures.