MFC r261681, r261682, r261683, r261684, r261685, r261686, r261687, r261688,
    r261689, r261690, r261783, r261791, r261836, r261837, r261841,

  Add FDT matching code to AT91 device drivers.

  Better nomatch messages: include compat string.  Also, flag devices as
  disabled in the successful probe message, but leave what that means to
  the actual driver (no semantic changes).

  Fix Embest board name and id.

  Honor the disabled status by only grabbing resources and returning
  when running under FDT in the AT91 SPI driver.