BeagleBoardPkg: Convert to build FatPkg from source

BeagleBoardPkg: Convert to build FatPkg from source

Now that FatPkg is open source (and therefore can be included in the
EDK II tree) we build and use it directly.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Build-tested-by: Leif Lindholm <leif.lindholm@linaro.org>
Build-tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>