[Buildroot] [PATCH v8] board: add support for Intel Galileo Gen 2

[Kinsella, Ray]

> Is mtools *always* used by genimage, or only if you build a vfat
> partition? I guess the later. And if that's the case, then it's a bit
> annoying to have host-genimage unconditionally select host-mtools.

Your correct the latter, you risk head scratching if a users try to use
genimage 
and get an error because mtools are missing. mtools is not a huge build
cost to incur?

I explicitly set

BR2_PACKAGE_HOST_GENIMAGE=y
BR2_PACKAGE_HOST_MTOOLS=y
 
to take care of this, but ideally I would only need to set
BR2_PACKAGE_HOST_GENIMAGE.