Platform/BeagleBoard: Import BeagleBoardPkg from edk2

https://bugzilla.tianocore.org/show_bug.cgi?id=1467



Import BeagleBoardPkg from edk2/master.

Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Ray Ni <ray.ni@intel.com>