M68k input drivers cleanup:
  - Remove remnants from the old input layer:
      o Config.help entries for the Amiga and Atari mouse drivers
      o Apollo keyboard code (including beep support)
      o Dummy keyboard initialization, keyboard repeat, and keyboard LEDs code
        for MVME147, Sun-3, Sun-3x,
      o Makefile entries for Atari keyboard, mouse and joystick drivers, and
        the HP300 Human Interface Loop driver
      o kbd-reset kernel command line parameters
      o defconfig entry for the Amiga mouse driver
      o Mac ADB mouse driver glue
      o Amiga and Mac ADB mouse driver minors
  - Always include new input layer configuration data