Add U-Boot machine configuration for the qemux86 and qemux86-64
to allow building U-Boot on those targets. This in turn allows
the auto-updater to update the U-Boot recipe.
Signed-off-by: Marek Vasut <marex@denx.de> Cc: Alexander Kanavin <alexander.kanavin@linux.intel.com> Cc: Otavio Salvador <otavio@ossystems.com.br> Cc: Richard Purdie <richard.purdie@linuxfoundation.org> Cc: Ross Burton <ross.burton@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>